Lines and Angles Vocabulary

Front

Lines that run from left to right

Back

Horizontal line

Front

Two lines that stay the same distance apart and never intersect

Back

Parallel lines

Front

An angle that measures LESS than 90 degrees

Back

Acute angle

Front

An angle that measures greater than 90 degrees

Back

Obtuse angle

Front

Two lines that meet or cross at any given point

Back

Intersecting lines

Front

An angle that measures exactly 90 degrees

Back

Right angle

Front

Lines that are perpendicular to each other

Back

Perpendicular lines

Front

A straight line that goes up and down

Back

Vertical line

Front

A line that divides an angle into two equal parts

Back

Angle bisector

Front

The point where two lines intersect

Back

Point of intersection