Q. Find the measure of a negative angle coterminal with 120∘. ____∘
Subtract 360° from 120°: To find a negative angle coterminal with 120°, subtract 360° from 120° because coterminal angles are separated by full rotations, which are 360°. Calculation: 120°−360°=−240°.
Check validity of −240°: Check if −240° is within the range of a full negative rotation −360°. It is, so −240° is a valid negative coterminal angle for 120°.
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