The main things to remember about angles is that they are measured starting from the positive x-axis, unless otherwise stated, and measured in a counter-clockwise direction.
We say that a whole revolution is 360 degrees, making an arrow pointing north a 90 degree angle, west a 180 angle, and south a 270 degree angle.
If we have an angle in degrees and we want the angle measure in radians we can use the conversion facto of
This means that if we want to convert back and forth
Convert the following from degrees to radians or radians to degrees. It is usually understood that if an angle has a in it the angle measure is given in radians.
To convert from degrees to radians, we multiply the degrees by . To convert in the other direction, radians to degrees, we multiply the radians by
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