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# Geo Proof Vocab

TermDefinition
Median of a Triangle A segment drawn from any vertex of a triangle to the midpoint of the opposite side; it divides the opposite side into two congruent segments.
Reflexive Property Anything congruent to itself (same location).
Substitution Property An equivalent segment/angle can be plugged in (different locations).
Addition Property Two congruent pieces can be added to two congruent pieces.
Subtraction Property Two congruent pieces can be subtracted from two congruent pieces.
Vertical Angles Vertical angles are congruent angles formed by intersecting lines that are opposite each other.
Definition of a midpoint It divides a line segment into two congruent line segments.
Definition of segment bisector It divides a line segment into two congruent line segments.
Definition of angle bisector It divides an angle into two congruent angles.
Definition of perpendicular lines These lines form right angles.
Definition of perpendicular bisector a line, segment or ray that divides a line segments into two congruent line segments and creates congruent right angles.
Complementary Angles are two angles whose sum is 90 degrees.
Supplementary Angles are two angles whose sum is 180 degrees.
Supplements (or Complements) of congruent angles are congruent.
The sum of angles on a line Angles on a line add to 180°.
Definition of a median of a triangle A segment drawn from any vertex of a triangle to the midpoint of the opposite side; it divides the opposite side into two congruent segments.
Definition of the altitude of a triangle A segment drawn from the vertex of a triangle so that it is perpendicular to the opposite side; creates a 90° angle.
Corresponding angles formed by parallel lines cut by a transversal. the angles which occupy the same relative position at each intersection where the transversal cuts the parallel lines. These angles are equal.
Alternate interior angles formed by parallel lines cut by a transversal. these angles which are inside the parallel lines and on alternate sides of the third line
Angles around a point add to 360 degrees.
Created by: ctaborsk
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