( ! ) Warning: file_get_contents(https://video.getaclass.ru/api/api.php?filelist%5B0%5D%5Bfilename%5D=%D0%A1%D0%B8%D0%BD%D1%83%D1%81+%D0%B8+%D0%BA%D0%BE%D1%81%D0%B8%D0%BD%D1%83%D1%81_1080p.mp4&filelist%5B0%5D%5Bext%5D=mp4&filelist%5B0%5D%5Bmime%5D=video%2Fmp4&filelist%5B0%5D%5Bquality%5D=1080p&filelist%5B1%5D%5Bfilename%5D=%D0%A1%D0%B8%D0%BD%D1%83%D1%81+%D0%B8+%D0%BA%D0%BE%D1%81%D0%B8%D0%BD%D1%83%D1%81_720p.mp4&filelist%5B1%5D%5Bext%5D=mp4&filelist%5B1%5D%5Bmime%5D=video%2Fmp4&filelist%5B1%5D%5Bquality%5D=720p&filelist%5B2%5D%5Bfilename%5D=%D0%A1%D0%B8%D0%BD%D1%83%D1%81+%D0%B8+%D0%BA%D0%BE%D1%81%D0%B8%D0%BD%D1%83%D1%81_480p.mp4&filelist%5B2%5D%5Bext%5D=mp4&filelist%5B2%5D%5Bmime%5D=video%2Fmp4&filelist%5B2%5D%5Bquality%5D=480p&filelist%5B3%5D%5Bfilename%5D=%D0%A1%D0%B8%D0%BD%D1%83%D1%81+%D0%B8+%D0%BA%D0%BE%D1%81%D0%B8%D0%BD%D1%83%D1%81_360p.mp4&filelist%5B3%5D%5Bext%5D=mp4&filelist%5B3%5D%5Bmime%5D=video%2Fmp4&filelist%5B3%5D%5Bquality%5D=360p&filelist%5B4%5D%5 in /var/www/www.getaclass.ru/htdocs/lib/class.videohostingapi.php on line 77
Call Stack
#TimeMemoryFunctionLocation
10.0000233912{main}( ).../index.php:0
20.0093795784Core::printContent( ).../index.php:21
30.0093796352Core::fetchContent( ).../class.core.php:190
40.0093796672CEdu->run( ).../class.core.php:142
50.0099814392Controller->run( ).../controller.edu.php:43
60.0101838464Command->execute( ).../class.controller.php:31
70.0106854224CommandCEduView->doExecute( ).../class.command.php:33
80.0107864864CommandCEduView->process( ).../cedu.view.php:11
90.0127975704CommandCEduView->videoFullLoad( ).../cedu.view.php:46
100.01381027608VideoHostingApi->getDownloadLink( ).../cedu.view.php:247
110.01381037800file_get_contents ( ).../class.videohostingapi.php:77

( ! ) Warning: file_get_contents(https://video.getaclass.ru/api/api.php?filelist%5B0%5D%5Bfilename%5D=%D0%A2%D0%B0%D0%BD%D0%B3%D0%B5%D0%BD%D1%81+%D0%B8+%D0%BA%D0%BE%D1%82%D0%B0%D0%BD%D0%B3%D0%B5%D0%BD%D1%81_1080p.mp4&filelist%5B0%5D%5Bext%5D=mp4&filelist%5B0%5D%5Bmime%5D=video%2Fmp4&filelist%5B0%5D%5Bquality%5D=1080p&filelist%5B1%5D%5Bfilename%5D=%D0%A2%D0%B0%D0%BD%D0%B3%D0%B5%D0%BD%D1%81+%D0%B8+%D0%BA%D0%BE%D1%82%D0%B0%D0%BD%D0%B3%D0%B5%D0%BD%D1%81_720p.mp4&filelist%5B1%5D%5Bext%5D=mp4&filelist%5B1%5D%5Bmime%5D=video%2Fmp4&filelist%5B1%5D%5Bquality%5D=720p&filelist%5B2%5D%5Bfilename%5D=%D0%A2%D0%B0%D0%BD%D0%B3%D0%B5%D0%BD%D1%81+%D0%B8+%D0%BA%D0%BE%D1%82%D0%B0%D0%BD%D0%B3%D0%B5%D0%BD%D1%81_480p.mp4&filelist%5B2%5D%5Bext%5D=mp4&filelist%5B2%5D%5Bmime%5D=video%2Fmp4&filelist%5B2%5D%5Bquality%5D=480p&filelist%5B3%5D%5Bfilename%5D=%D0%A2%D0%B0%D0%BD%D0%B3%D0%B5%D0%BD%D1%81+%D0%B8+%D0%BA%D0%BE%D1%82%D0%B0%D0%BD%D0%B3%D0%B5%D0%BD%D1%81_360p.mp4&filelist%5B3%5D%5Bext%5D=mp4&f in /var/www/www.getaclass.ru/htdocs/lib/class.videohostingapi.php on line 77
Call Stack
#TimeMemoryFunctionLocation
10.0000233912{main}( ).../index.php:0
20.0093795784Core::printContent( ).../index.php:21
30.0093796352Core::fetchContent( ).../class.core.php:190
40.0093796672CEdu->run( ).../class.core.php:142
50.0099814392Controller->run( ).../controller.edu.php:43
60.0101838464Command->execute( ).../class.controller.php:31
70.0106854224CommandCEduView->doExecute( ).../class.command.php:33
80.0107864864CommandCEduView->process( ).../cedu.view.php:11
90.0127975704CommandCEduView->videoFullLoad( ).../cedu.view.php:46
103.02561032464VideoHostingApi->getDownloadLink( ).../cedu.view.php:247
113.02571042880file_get_contents ( ).../class.videohostingapi.php:77

( ! ) Warning: file_get_contents(https://video.getaclass.ru/api/api.php?filelist%5B0%5D%5Bfilename%5D=%D0%A2%D1%80%D0%B8%D0%B3%D0%BE%D0%BD%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D0%BE%D0%BA%D1%80%D1%83%D0%B6%D0%BD%D0%BE%D1%81%D1%82%D1%8C_1080p.mp4&filelist%5B0%5D%5Bext%5D=mp4&filelist%5B0%5D%5Bmime%5D=video%2Fmp4&filelist%5B0%5D%5Bquality%5D=1080p&filelist%5B1%5D%5Bfilename%5D=%D0%A2%D1%80%D0%B8%D0%B3%D0%BE%D0%BD%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D0%BE%D0%BA%D1%80%D1%83%D0%B6%D0%BD%D0%BE%D1%81%D1%82%D1%8C_720p.mp4&filelist%5B1%5D%5Bext%5D=mp4&filelist%5B1%5D%5Bmime%5D=video%2Fmp4&filelist%5B1%5D%5Bquality%5D=720p&filelist%5B2%5D%5Bfilename%5D=%D0%A2%D1%80%D0%B8%D0%B3%D0%BE%D0%BD%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B0%D1%8F+%D0%BE%D0%BA%D1%80%D1%83%D0%B6%D0%BD%D0%BE%D1%81%D1%82%D1%8C_480p.mp4&filelist%5B2%5D%5Bext%5D=mp4&filelist%5B2%5D%5Bmime%5D=video%2Fmp4&filelist%5B2%5D%5Bquality in /var/www/www.getaclass.ru/htdocs/lib/class.videohostingapi.php on line 77
Call Stack
#TimeMemoryFunctionLocation
10.0000233912{main}( ).../index.php:0
20.0093795784Core::printContent( ).../index.php:21
30.0093796352Core::fetchContent( ).../class.core.php:190
40.0093796672CEdu->run( ).../class.core.php:142
50.0099814392Controller->run( ).../controller.edu.php:43
60.0101838464Command->execute( ).../class.controller.php:31
70.0106854224CommandCEduView->doExecute( ).../class.command.php:33
80.0107864864CommandCEduView->process( ).../cedu.view.php:11
90.0127975704CommandCEduView->videoFullLoad( ).../cedu.view.php:46
106.02571036888VideoHostingApi->getDownloadLink( ).../cedu.view.php:247
116.02571047952file_get_contents ( ).../class.videohostingapi.php:77

( ! ) Warning: file_get_contents(https://video.getaclass.ru/api/api.php?filelist%5B0%5D%5Bfilename%5D=%D0%A4%D0%BE%D1%80%D0%BC%D1%83%D0%BB%D1%8B+%D0%BF%D1%80%D0%B8%D0%B2%D0%B5%D0%B4%D0%B5%D0%BD%D0%B8%D1%8F_1080p.mp4&filelist%5B0%5D%5Bext%5D=mp4&filelist%5B0%5D%5Bmime%5D=video%2Fmp4&filelist%5B0%5D%5Bquality%5D=1080p&filelist%5B1%5D%5Bfilename%5D=%D0%A4%D0%BE%D1%80%D0%BC%D1%83%D0%BB%D1%8B+%D0%BF%D1%80%D0%B8%D0%B2%D0%B5%D0%B4%D0%B5%D0%BD%D0%B8%D1%8F_720p.mp4&filelist%5B1%5D%5Bext%5D=mp4&filelist%5B1%5D%5Bmime%5D=video%2Fmp4&filelist%5B1%5D%5Bquality%5D=720p&filelist%5B2%5D%5Bfilename%5D=%D0%A4%D0%BE%D1%80%D0%BC%D1%83%D0%BB%D1%8B+%D0%BF%D1%80%D0%B8%D0%B2%D0%B5%D0%B4%D0%B5%D0%BD%D0%B8%D1%8F_480p.mp4&filelist%5B2%5D%5Bext%5D=mp4&filelist%5B2%5D%5Bmime%5D=video%2Fmp4&filelist%5B2%5D%5Bquality%5D=480p&filelist%5B3%5D%5Bfilename%5D=%D0%A4%D0%BE%D1%80%D0%BC%D1%83%D0%BB%D1%8B+%D0%BF%D1%80%D0%B8%D0%B2%D0%B5%D0%B4%D0%B5%D0%BD%D0%B8%D1%8F_360p.mp4&filelist%5B3%5D%5Bext%5D=mp4&filel in /var/www/www.getaclass.ru/htdocs/lib/class.videohostingapi.php on line 77
Call Stack
#TimeMemoryFunctionLocation
10.0000233912{main}( ).../index.php:0
20.0093795784Core::printContent( ).../index.php:21
30.0093796352Core::fetchContent( ).../class.core.php:190
40.0093796672CEdu->run( ).../class.core.php:142
50.0099814392Controller->run( ).../controller.edu.php:43
60.0101838464Command->execute( ).../class.controller.php:31
70.0106854224CommandCEduView->doExecute( ).../class.command.php:33
80.0107864864CommandCEduView->process( ).../cedu.view.php:11
90.0127975704CommandCEduView->videoFullLoad( ).../cedu.view.php:46
109.02531040784VideoHostingApi->getDownloadLink( ).../cedu.view.php:247
119.02541051192file_get_contents ( ).../class.videohostingapi.php:77

( ! ) Warning: file_get_contents(https://video.getaclass.ru/api/api.php?filelist%5B0%5D%5Bfilename%5D=GetAClass+-+%D0%A2%D1%80%D0%B8%D0%B3%D0%BE%D0%BD%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%8F+5.+%D0%A1%D0%B8%D0%BD%D1%83%D1%81+%D0%B8+%D0%BA%D0%BE%D1%81%D0%B8%D0%BD%D1%83%D1%81+%D1%81%D1%83%D0%BC%D0%BC%D1%8B_1080p.mp4&filelist%5B0%5D%5Bext%5D=mp4&filelist%5B0%5D%5Bmime%5D=video%2Fmp4&filelist%5B0%5D%5Bquality%5D=1080p&filelist%5B1%5D%5Bfilename%5D=GetAClass+-+%D0%A2%D1%80%D0%B8%D0%B3%D0%BE%D0%BD%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%8F+5.+%D0%A1%D0%B8%D0%BD%D1%83%D1%81+%D0%B8+%D0%BA%D0%BE%D1%81%D0%B8%D0%BD%D1%83%D1%81+%D1%81%D1%83%D0%BC%D0%BC%D1%8B_720p.mp4&filelist%5B1%5D%5Bext%5D=mp4&filelist%5B1%5D%5Bmime%5D=video%2Fmp4&filelist%5B1%5D%5Bquality%5D=720p&filelist%5B2%5D%5Bfilename%5D=GetAClass+-+%D0%A2%D1%80%D0%B8%D0%B3%D0%BE%D0%BD%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%8F+5.+%D0%A1%D0%B8%D0%BD%D1%83%D1%81+%D0%B8+%D0%BA%D0%BE%D1%81%D0%B8%D0%BD%D1%83%D1%81+%D1%81%D1%83%D0%BC%D0%BC%D1%8B_480p. in /var/www/www.getaclass.ru/htdocs/lib/class.videohostingapi.php on line 77
Call Stack
#TimeMemoryFunctionLocation
10.0000233912{main}( ).../index.php:0
20.0093795784Core::printContent( ).../index.php:21
30.0093796352Core::fetchContent( ).../class.core.php:190
40.0093796672CEdu->run( ).../class.core.php:142
50.0099814392Controller->run( ).../controller.edu.php:43
60.0101838464Command->execute( ).../class.controller.php:31
70.0106854224CommandCEduView->doExecute( ).../class.command.php:33
80.0107864864CommandCEduView->process( ).../cedu.view.php:11
90.0127975704CommandCEduView->videoFullLoad( ).../cedu.view.php:46
1012.02551045768VideoHostingApi->getDownloadLink( ).../cedu.view.php:247
1112.02551057192file_get_contents ( ).../class.videohostingapi.php:77

( ! ) Warning: file_get_contents(https://video.getaclass.ru/api/api.php?filelist%5B0%5D%5Bfilename%5D=%D0%A1%D0%BB%D0%B5%D0%B4%D1%81%D1%82%D0%B2%D0%B8%D0%B5+%D0%B8%D0%B7+%D1%82%D0%B5%D0%BE%D1%80%D0%B5%D0%BC+%D1%81%D0%BB%D0%BE%D0%B6%D0%B5%D0%BD%D0%B8%D1%8F_1080p.mp4&filelist%5B0%5D%5Bext%5D=mp4&filelist%5B0%5D%5Bmime%5D=video%2Fmp4&filelist%5B0%5D%5Bquality%5D=1080p&filelist%5B1%5D%5Bfilename%5D=%D0%A1%D0%BB%D0%B5%D0%B4%D1%81%D1%82%D0%B2%D0%B8%D0%B5+%D0%B8%D0%B7+%D1%82%D0%B5%D0%BE%D1%80%D0%B5%D0%BC+%D1%81%D0%BB%D0%BE%D0%B6%D0%B5%D0%BD%D0%B8%D1%8F_720p.mp4&filelist%5B1%5D%5Bext%5D=mp4&filelist%5B1%5D%5Bmime%5D=video%2Fmp4&filelist%5B1%5D%5Bquality%5D=720p&filelist%5B2%5D%5Bfilename%5D=%D0%A1%D0%BB%D0%B5%D0%B4%D1%81%D1%82%D0%B2%D0%B8%D0%B5+%D0%B8%D0%B7+%D1%82%D0%B5%D0%BE%D1%80%D0%B5%D0%BC+%D1%81%D0%BB%D0%BE%D0%B6%D0%B5%D0%BD%D0%B8%D1%8F_480p.mp4&filelist%5B2%5D%5Bext%5D=mp4&filelist%5B2%5D%5Bmime%5D=video%2Fmp4&filelist%5B2%5D%5Bquality%5D=480p&filelist%5B3%5D%5Bfilename%5D=%D0%A in /var/www/www.getaclass.ru/htdocs/lib/class.videohostingapi.php on line 77
Call Stack
#TimeMemoryFunctionLocation
10.0000233912{main}( ).../index.php:0
20.0093795784Core::printContent( ).../index.php:21
30.0093796352Core::fetchContent( ).../class.core.php:190
40.0093796672CEdu->run( ).../class.core.php:142
50.0099814392Controller->run( ).../controller.edu.php:43
60.0101838464Command->execute( ).../class.controller.php:31
70.0106854224CommandCEduView->doExecute( ).../class.command.php:33
80.0107864864CommandCEduView->process( ).../cedu.view.php:11
90.0127975704CommandCEduView->videoFullLoad( ).../cedu.view.php:46
1015.02551049592VideoHostingApi->getDownloadLink( ).../cedu.view.php:247
1115.02551060536file_get_contents ( ).../class.videohostingapi.php:77

( ! ) Warning: file_get_contents(https://video.getaclass.ru/api/api.php?filelist%5B0%5D%5Bfilename%5D=%D0%A2%D1%80%D0%B8%D0%B3%D0%BE%D0%BD%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%8F+7+%D0%A2%D0%B5%D0%BE%D1%80%D0%B5%D0%BC%D0%B0+%D1%81%D0%B8%D0%BD%D1%83%D1%81%D0%BE%D0%B2_1080p.mp4&filelist%5B0%5D%5Bext%5D=mp4&filelist%5B0%5D%5Bmime%5D=video%2Fmp4&filelist%5B0%5D%5Bquality%5D=1080p&filelist%5B1%5D%5Bfilename%5D=%D0%A2%D1%80%D0%B8%D0%B3%D0%BE%D0%BD%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%8F+7+%D0%A2%D0%B5%D0%BE%D1%80%D0%B5%D0%BC%D0%B0+%D1%81%D0%B8%D0%BD%D1%83%D1%81%D0%BE%D0%B2_720p.mp4&filelist%5B1%5D%5Bext%5D=mp4&filelist%5B1%5D%5Bmime%5D=video%2Fmp4&filelist%5B1%5D%5Bquality%5D=720p&filelist%5B2%5D%5Bfilename%5D=%D0%A2%D1%80%D0%B8%D0%B3%D0%BE%D0%BD%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%8F+7+%D0%A2%D0%B5%D0%BE%D1%80%D0%B5%D0%BC%D0%B0+%D1%81%D0%B8%D0%BD%D1%83%D1%81%D0%BE%D0%B2_480p.mp4&filelist%5B2%5D%5Bext%5D=mp4&filelist%5B2%5D%5Bmime%5D=video%2Fmp4&filelist%5B2%5D%5Bquality%5D=480p& in /var/www/www.getaclass.ru/htdocs/lib/class.videohostingapi.php on line 77
Call Stack
#TimeMemoryFunctionLocation
10.0000233912{main}( ).../index.php:0
20.0093795784Core::printContent( ).../index.php:21
30.0093796352Core::fetchContent( ).../class.core.php:190
40.0093796672CEdu->run( ).../class.core.php:142
50.0099814392Controller->run( ).../controller.edu.php:43
60.0101838464Command->execute( ).../class.controller.php:31
70.0106854224CommandCEduView->doExecute( ).../class.command.php:33
80.0107864864CommandCEduView->process( ).../cedu.view.php:11
90.0127975704CommandCEduView->videoFullLoad( ).../cedu.view.php:46
1018.02561053816VideoHostingApi->getDownloadLink( ).../cedu.view.php:247
1118.02561064848file_get_contents ( ).../class.videohostingapi.php:77

( ! ) Warning: file_get_contents(https://video.getaclass.ru/api/api.php?filelist%5B0%5D%5Bfilename%5D=%D0%A2%D1%80%D0%B8%D0%B3%D0%BE%D0%BD%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%8F+8+%D0%A1%D0%BA%D0%B0%D0%BB%D1%8F%D1%80%D0%BD%D0%BE%D0%B5+%D0%BF%D1%80%D0%BE%D0%B8%D0%B7%D0%B2%D0%B5%D0%B4%D0%B5%D0%BD%D0%B8%D0%B5_1080p.mp4&filelist%5B0%5D%5Bext%5D=mp4&filelist%5B0%5D%5Bmime%5D=video%2Fmp4&filelist%5B0%5D%5Bquality%5D=1080p&filelist%5B1%5D%5Bfilename%5D=%D0%A2%D1%80%D0%B8%D0%B3%D0%BE%D0%BD%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%8F+8+%D0%A1%D0%BA%D0%B0%D0%BB%D1%8F%D1%80%D0%BD%D0%BE%D0%B5+%D0%BF%D1%80%D0%BE%D0%B8%D0%B7%D0%B2%D0%B5%D0%B4%D0%B5%D0%BD%D0%B8%D0%B5_720p.mp4&filelist%5B1%5D%5Bext%5D=mp4&filelist%5B1%5D%5Bmime%5D=video%2Fmp4&filelist%5B1%5D%5Bquality%5D=720p&filelist%5B2%5D%5Bfilename%5D=%D0%A2%D1%80%D0%B8%D0%B3%D0%BE%D0%BD%D0%BE%D0%BC%D0%B5%D1%82%D1%80%D0%B8%D1%8F+8+%D0%A1%D0%BA%D0%B0%D0%BB%D1%8F%D1%80%D0%BD%D0%BE%D0%B5+%D0%BF%D1%80%D0%BE%D0%B8%D0%B7%D0%B2%D0%B5%D0%B4%D0%B5%D0%BD%D0%B8%D0 in /var/www/www.getaclass.ru/htdocs/lib/class.videohostingapi.php on line 77
Call Stack
#TimeMemoryFunctionLocation
10.0000233912{main}( ).../index.php:0
20.0093795784Core::printContent( ).../index.php:21
30.0093796352Core::fetchContent( ).../class.core.php:190
40.0093796672CEdu->run( ).../class.core.php:142
50.0099814392Controller->run( ).../controller.edu.php:43
60.0101838464Command->execute( ).../class.controller.php:31
70.0106854224CommandCEduView->doExecute( ).../class.command.php:33
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Тригонометрия. Курс "Просто математика" | Бесплатные обучающие видео и уроки по физике и математике для школьников на образовательном ресурсе GetAClass

Тригонометрия

Отдельные разделы тригонометрии рассеяны по всему школьному курсу математики. А мы собрали их все вместе и рассказываем за девять 10-минутных уроков: от исчисления углов в прямоугольном треугольнике до теоремы косинусов. Самый сложный раздел школьной тригонометрии — это вывод формул синуса и косинуса суммы двух углов. Когда вы разберётесь с этим разделом, вы без большого труда справитесь и со всем остальным.

Измерить вес тела можно также пружинными весами (рис. 3). Груз давит на дно чаши и сжимает пружину внутри весов. Чем больше вес тела, тем больше сжатие пружины. Чтобы измерять вес, пружинные весы нужно предварительно проградуировать, используя эталонные грузы. Как возникает действие груза на пружинные весы? Известно, что все тела притягиваются Землей силой тяжести. Груз давит на чашу весов силой, равной по величине силе тяжести, которая уравновешивается пружиной. Эту силу называют весом тела.

№ 12382
Не решалось
простая

Самолёт взлетает со скоростью 150 м/с под углом 30° к горизонту. С какой скоростью он набирает высоту?

м/с
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№ 12388
Не решалось
средняя

Вершина вертикальной мачты высотой 50 м соединена с поверхностью земли тремя тросами, образующими углы 30°, 45°, 60° с горизонталью. Определите суммарную длину всех трёх тросов. Округлите ответ до метров.

м
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№ 12389
Не решалось
простая

Определите высоту отвесной скалы, если известно, что из точки, удалённой по горизонтали на 500 м от её подножия, вершина скалы видна под углом 20° к горизонту. Округлите ответ до метров.

м
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№ 12390
Не решалось
простая

Найдите угол подъёма шоссейной дороги, если на расстоянии 200 м высота подъёма составила 6 м. Округлите ответ до десятых долей градуса.

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№ 12391
Не решалось
простая

Насыпь в сечении представляет собой равнобедренную трапецию с основанием 12 м и высотой 3 м. Какова ширина верхней части насыпи, если угол её откоса равен 30°? Округлите ответ до сотых долей метра.

м
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№ 12392
Не решалось
простая

Найдите длину стороны правильного девятиугольника, описанного около окружности радиуса  R = 10 см. Округлите ответ до десятых долей сантиметра.

см
Ответить

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