If cosθ 12/13, then sinθ equals?
- 5/12
- 5/13
- 5/14
- None of these
Explanation
cosθ = adjacent/hypotenuse = 12/13
Use sin²θ + cos²θ = 1
sin²θ = 1 - (12/13)² = 1 - 144/169 = 25/169
sinθ = ±5/13
If we assume θ is in quadrant I, then sinθ = 5/13
Last verified on 08-05-2026
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