Предмет: Геометрия, автор: npetkilev

помогите решить 1 и 2 номера

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Ответы

Автор ответа: sova761

1) cos B= AB/BC. cosB=4,2/8,4=0,5.
2)МС- биссектриса.
уголД=90°, угол ДСМ=70°, то уголСМД=20°,. тогда угол ДМА=40°.
отсюда угол ДАМ= 90-40=50°.

Автор ответа: npetkilev

можно 1 номер по подробнее?

Автор ответа: sova761

треуглльник АВС прямоугольный отношение прилежащего катета к гипотенузе есть косинус угла. косинус 60°= 0,5.

Автор ответа: sova761

да отсюда угол В=60°

Автор ответа: npetkilev

спасибо

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