Converts between degrees, radians, gradians, revolutions, and quadrants.

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- gradians = 1.1111111 x degrees
- degrees = 360 * revolutions
- quadrants = degrees/90

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- angle
- the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle.
- degree
- A unit of angle measurement, or a unit of temperature measurement
- gradian
- defined as one hundredth of the right angle. This is equal to π/200 or 9/10°
- quadrant
- 1 of 4 sections on the Cartesian graph. Quadrant I: (x, y), Quadrant II (-x, y), Quadrant III, (-x, -y), Quadrant IV (x, -y)
- radian
- a unit of plane angular measurement that is equal to the angle at the center of a circle subtended by an arc whose length equals the radius or approximately 180°/π ~ 57.3 degrees.
- revolution
- A 360° angle, a full rotation, a complete turn so it points back the same way.
- trig angle conversions