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More About Angles

Author:Elizabeth McCollum
Topic:Angles
A point is in the interior of an angle if it is between points that lie on each side of the angle.  A point is in the exterior of an angle if it is not on the angle or in its interior. 
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Angle Addition Postulate

If P is in the interior of <RST, then m<RSP+m<PST=m<RST.
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