Degrees to radians

What this lesson shows

Degrees aren't the only way to measure an angle. Take the radius itself… bend it… and lay it along the rim of the circle. The angle that arc spans is called 1 RADIAN.

Try it yourself

Real questions from this lesson's worksheets — answers below each one.

1. Convert 30° to radians
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   π/6
2. Drag the point around the circle to the angle π/6 radians.
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   30
3. Convert π/4 radians to degrees
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   45°
4. Evaluate tan 45°.
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   1