Question

dê o seno em cada caso:
a) sen30°=x/4
b) sen45°=x/2

Answer 1

a) sen30°=x/4 ( sen30° = 1/2)
1/2 = x/4
2x = 4
x = 4/2
x=2

b) sen45°=x/2 ( sen45° = \/2/2)
\/2/2 = x/2
2x = 2\/2
x = 2\/2 : 2
x= \/2 ( raiz de dois)