Postulate: Angle Addition
Postulate
Point B lies in the interior of Ð
XYZ, if and only if, mÐXYB + mÐBYZ = mÐXYZ
Like the Segment Addition Postulate, the
Angle Addition Postulate is often used in geometric proofs when
an arbitrary point is designated on the geometric figure in
question, to facilitate the formulation of the required proof.
Complementary Angles are two angles
whose measures sum up to 90°. The angles are complement of each
other.
Supplementary Angles are two angles
whose measures sum up to 180°. The angles are supplement of each
other.
Congruent angles are angles that have
equal measure.
Adjacent angles are two coplanar angles
having a common vertex and a common side, but no common interior
points.
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