Question

Решите 11 и 12.Решите пожалуйста!

Answer 1

11)
S = (5+1) * h = 6*h
h² = (1.25)² - 1² (теорема Пифагора)
h² = (1.25-1)(1.25+1) = 0.25*2.25 = (0.5)² * (1.5)²
h = 0.5 * 1.5 = 0.75 
S = 6*0.75 = 4.5
12)
tg(A) = 3/4 = 0.75