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# Geom Ch1Ch2 Ths Defs

### Reviews some of the theorems and definitions learned in chapters 1 and 2

If two lines intersect, then they intersect in ***************************. exactly one point
Through a line and a point not in the there, there is ************************. exactly one plane
Midpoint Theorem: If M is the midpoint of segment AB, then AM=1/2 AB and MB=1/2 AB
Definition of a Midpoint: If M is the midpoint of segment AB, then AM=MB
Angle Bisector Theorem: If ray BX is the bisector of Angle ABC, then the measure of Angle ABX = 1/2 the measure of Angle ABC and the measure of Angle XBC = 1/2 the measure of Angle ABC
Definition of an Angle Bisector: If ray BX is the bisector of Angle ABC, then the measure of Angle ABX = the measure of Angle XBC
Vertical Angles are congruent
If two lines are perpendicular, then they form ********************* angles congruent adjacent
If two lines form congruent adjacent angles, then the lines are ****************. perpendicular
If the exterior sides of two adjacent angles are perpendicular, then the angles are ***********************. complementary
If the exterior sides of two adjacent angles ***********************, then the angles are complementary. are perpendicular
If two angles are supplements of congruent angles, then the two angles ************************. are congruent
If two angles are complements of congruent angles, then the two angles are ******************. congruent
Supplementary Angles are two angles whose measurements add up to ******. 180
Complementary Angles are two angles whose measurements add up to *******. 90
Created by: sjmbates