Question

В треугольнике угол С=90, АВ=50, ВС=30. Найти cos А.

Answer 1

1) АС = √(50²-30²) = √(2500-900) = √1600 = 40
cos(A) = AC/AB = 40/50 = 4/5

Answer 2

1) АС = √(50²-30²) = √(2500-900) = √1600 = 40
cos(A) = AC/AB = 40/50 = 4/5