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Kierra
Mathematics
2 July, 03:31
Which expression is equivalent to cos 120°?
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Nola Freeman
2 July, 03:51
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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
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