Question

Using the unit circle, determine the value of sin(-240°).

A) -1/2
B) √3/2
C) 1/2
D) -√3/2

Answer 1

B. √3/2.

Explanation:

If we follow the circle from (1,0) clockwise through 240 degrees we end up at 120 degrees.

sin(120)

= √3/2