Question

Calcule seno, cosseno e tangente de cada ângulo indicado

Answer 1

Resposta:

Explicação passo-a-passo:

Sen (a) = 2/4 = 1/2 = (a) = 30⁰

Cos 30⁰ = x/4 =

Raiz3/2= x/4

2x = Raiz3.4

x = 4 raiz3/2 =

x = 2 raiz 3

Tan = sen30/

Cos30

Tan(a) = 1/2 = 1/2 . 2/ raiz 3 =

Raiz 3/2

= 2 / 2 raiz3 = 1 / raiz3

B) cos a = 12/15

Cos a = 4/5

a = 36,86⁰

Sen 36,86 = x/ 15

0,6 = x/15

x = 0,6 . 15

x = 9

Tan a = sen a

cos a

Tan a = 9/15 = 9/15 . 15/12 = 9/12 =

12/15

Tan a = 3/4

Tan 36,86 = 3/4