Question

Whats his mistake and the correct awnser

Answer 1

Answer:

θ ≈ 35.7°

Step-by-step explanation:

His mistake was in using the wrong trig. ratio

Instead of using cosine he should have used the sine ratio

sinθ = $\frac{opposite}{hypotenuse}$ = $\frac{7}{12}$ , then

θ = $sin^{-1}$ ($\frac{7}{12}$ ) ≈ 35.7° ( to the nearest tenth )