Proofs Definitions

Bisector

Divides a segment into two congruent segments.

Midpoint

Divides a segment into two congruent segments.

Angle Bisector

Divides an angle into two congruent angles.

Perpendicular Lines (⊥)

Two lines that intersect to form a right angle.

Right Angle

A triangle that contains a right triangle.

Congruent Right Angles

All right angles are congruent to each other.

Perpendicular Bisector

A line that is perpendicular to a segment and divides it into two congruent segments.

Corresponding

If parallel lines are cut by a transversal, then _____ angles are congruent.

Alternate Interior

If parallel lines are cut by a transversal, then _____ angles are congruent.

Isosceles Triangle

A triangle with two congruent sides and two congruent base angles.

Isosceles

If a triangle has two congruent angles or two congruent sides, it is an ______ triangle.

Intersecting lines

If a diagram has _____ then the vertical angles are congruent.

Reflexive Property

Overlapping segments or angles are congruent to themselves.

Congruent

Marked with matching arcs or swoops in a diagram.

Congruent

Marked with matching tick marks in a diagram.

Parallel

Marked with matching arrows in a diagram.