Geometry Chapter 1.4 Angles and their Measures:
I) Vocabulary and Postulates:
A) Angle - consists of two different rays that have the same initial point.
1) Vertex - the initial point of the angle.
2) Rays of an angle - the sides of the angle.
B) Congruent Angles - angles that have the same measure.
C) Angle Addition Postulate - If P is on the interior of angle RST, then measure of angle RSP + measure of angle PSP = measure of angle RST.
D) Acute Angle - an angle that's measure is between zero and ninety degrees.
E) Right Angle - an angle that's measure is 90 degrees.
F) Obtuse Angle - an angle that's measure is between 90 degrees and 180 degrees.
G) Straight Angle - an angle that's measure is 180 degrees.
H) Adjacent Angles - two angles are adjacent angles if they share a common vertex AND a common side, but do not have any common interior points.
