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What is the meaning of angle in senior one mathematics? Give an example to illustrate-degree.
Rotation angle is the conversion between angle and radian, and 180 degree in angle system = π in arc system.

For example: 90 degrees =π/2, 45 degrees = π/4. ...

Angular radian formula: (angle/180 degrees) ×π

The radian angle formula is (radian /π)× 180 degrees.

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