Question

Find cosθ, where θ is the angle shown.Give an exact value, not a decimal approximation.cosθ=

Answer 1

1.- Calculate the adjacent side

5^2 = 4^2 + x^2

x^2 = 5^2 - 4^2

x^2 = 25 - 16

x^2 = 9

x = 3

2.- Calculate cos 0

cos 0 = 3/5 This is the answer to your question