Question

When finding cosθ=3√2
on a unit circle, what type of special right triangle or a ray is used?(1 point)
Responses

30-60-90 triangle
30-60-90 triangle

a vertical ray from the origin
a vertical ray from the origin

45-45-90 triangle
45-45-90 triangle

a horizontal ray from the origin
a horizontal ray from the origin

Answer 1

45-45-90 triangle

Because cosine values involving √2/2 come from a 45° reference angle (the 45-45-90 special right triangle gives cos = ±√2/2).