Geometry Basics

Front

When two lines intersect at a right angle.

Back

Perpendicular lines

Front

Two or more lines that never intersect.

Back

Parallel lines

Front

A line that intersects two or more lines.

Back

Transversal

Front

Angles between two parallel lines that lie opposite the transversal. These angles are congruent.

Back

Alternate Interior Angles

Front

Angles located between the two parallel lines.

Back

Interior Angles

Front

Angles that lie outside the two parallel lines.

Back

Exterior Angles

Front

Angles that lie on opposite sides of the transversal. These angles are congruent.

Back

Alternate Exterior Angles

Front

Having the same measure; equivalent.

Back

Congruent

Front

Angles that are in the same position on two parallel lines in relation to the transversal.

Back

Corresponding Angles

Front

Part of a line containing two endpoints and all of the points between them.

Back

Line Segment