Question

On a unit circle, 90=pi/2radians. Identify the terminal point and sin 0.A. Terminal point: (1, 0); sin 0 = 1B. Terminal point: (1, 0); sin 0 = 0C. Terminal point: (0, 1); sin 0 = 0D. Terminal point: (0,1); sin 0 = 1

Answer 1

We can see that

$\theta=\frac{\pi}{2}$

then,

$\sin \theta=\sin \frac{\pi}{2}=1$

Since an angle in a unit circle start at the horizontal axis and grows counterclockwise:

hence, the terminal point is at (0,1)

The, the answer is the last option D.