which of the following correctly uses the special triangles on the unit circle to determine 0 in degrees when cos0 = √2/2? you may assume that 0° ≤ 0 ≤ 180°
60°
30°
45°
90°
The correct answer is 45°.
In the unit circle, when cos(45°) = √2/2, it corresponds to the 45° angle in the special right triangle, which has sides of 1, 1, and √2.