Which expression is equivalent to cos 120°?

cos 120° = -1/2

Step-by-step explanation:

cos 120° =  (adjacent side) / (hypotenuse.

Here the adjacent side (the side next to the central angle in this 30-60-90 triangle) is -1.  Then the hypotenuse is 2 and the opposite side is √3.

Thus, cos 120° = -1/2

false

step-by-step explanation:

rulers and compasses arent required in order to bisect an angle because when bisecting angles, you're making a "half circle" and considering in order to bisect an angle it wouldn't be straight, you wouldn't need either of the two