Sine Calculator
sin(θ) is the ratio of the opposite side to the hypotenuse in a right triangle, and the y-coordinate of the corresponding unit-circle point.
Sine is the y-coordinate on the unit circle, or opposite/hypotenuse in a right triangle.
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Example problems
How this solver works
- Read the angle.
- Return an exact value from the unit circle when possible.
Formula
Right-triangle definition.
Worked examples
sin(30°)
- 1/2
Answer: 1/2
Common mistakes
Using sine for adjacent
Adjacent over hypotenuse is cosine.
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Frequently asked questions
What is sin(90°)?
1. That is the top of the unit circle.