Ответы на вопрос:
Ihave many friends.but my best friend is (name). he always helps me. i can always turn to her whenever i’m in trouble, and she never fails to help. when we gather, we play computer games, make lots of noise and walk.we study in the same class (9-a).he is very friendly, attractive and clever.
По теореме пифагора найдем нв нв^2=ab^2-ah^2=40^2-(20корней из3)^2=1600-400*3=400 hb=корень из 400=20 cosb=hb/ab=20/40=1/2=0,5
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