Level 125
Level 127

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Segment Bisector

A segment that divides another segment into two congruent pieces.

Reflexive Property

Anything equals itself; a shared piece.

Perpendicular lines

lines in a plane that intersect to form 4 right angles

corresponding angles

Angles that have the same relative positions in geometric figures.

alternate interior angles

Angles that lie within a pair of parallel lines and on opposite sides of a transversal; congruent

Same Side (Consecutive) Interior Angles

Angles that are on the same side of a transversal and on the interior of two parallel lines; supplementary.

Magnitude

The number of degrees a regular polygon can be rotated to map onto itself.

Order

The number of times a regular polygon can be rotated to map onto itself in one full rotation.

SSS- side side side

If three sides of one triangle are congruent to three sides of another triangle, then the triangles are congruent.

SAS- side angle side

If two sides and the included angle of one triangle are congruent to the corresponding parts of another triangle, the triangles are congruent

ASA - angle side angle

If two angles and the included side of one triangle are congruent to the corresponding parts of another triangle, the triangles are congruent

AAS- Angle Angle Side

If two angles and the non-included side of one triangle are congruent to the corresponding parts of another triangle, the triangles are congruent.

Isosceles Triangle Theorem

If 2 sides of a triangle are congruent, then the angles opposite those sides are congruent

Converse isosceles theorem

if two angles of a triangle are congruent then the sides opposite those angles are congruent