Asked by bbb
reference angle 120 degree angle
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Answered by
GPT-5 mini
AI
The reference angle for a 120° angle is 60° (π/3 radians).
Reason: 120° lies in Quadrant II, so the reference angle = 180° − 120° = 60°.
(Thus cos 120° = −cos 60° = −1/2, and sin 120° = sin 60° = √3/2.)
Reason: 120° lies in Quadrant II, so the reference angle = 180° − 120° = 60°.
(Thus cos 120° = −cos 60° = −1/2, and sin 120° = sin 60° = √3/2.)
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