Предмет: Геометрия, автор: шкоольница

Большое основание равнобедренной трапеции равно 37 , боковая сторона равна 15 . Косинус одного из углов трапеции равен 0,8 . Найдите меньшее основание трапеции.

Ответы

Автор ответа: Тилли

В трапеции ABCD большее основание обозначим как AD,меньшее-BC,высоту-BH.

Нам дан cos угла А(или D)-так как этот угол острый(исходя из знака cos,при тупом угле он был бы с минусом).

Рассмотрим прямоугольный треугольник ABH.Гипотенуза=15,cosА-8/10.Найдем катет AH.

cosA=AH/AB.

8/10=x/15.

Отсюда x=12.

Меньшее основание =AD-два катета треугольника ABH

BC=37-2*12=13.

Вроде бы так.)

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Payback 2: The Battle Sandbox is an action video game developed and published by Apex Designs Entertainment Ltd, and is a remake of, or sequel to the original Payback.[2] It was first released on October 4th, 2012 for iOS, and became free to play in 2013.[3][4] It is also now also available on Android since October 10th, 2014.[5]
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Developer(s)Apex Designs EntertainmentPublisher(s)Apex Designs EntertainmentProgrammer(s)James Daniels [1]Composer(s)Wolfgang Amadeus MozartSeriesPaybackEngineUnityPlatform(s)Android, iOSRelease

WW: October 4th, 2012

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