Geometric Figures, Types of Lines, and Angles

Front

What are parallel lines?

Back

Lines that never meet and are always the same distance apart.

Front

What is an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

An angle that measures greater than 90 degrees.

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.

Front

What is a straight angle?

Back

An angle that measures exactly 180 degrees.

Front

What do we call two lines that intersect at a point?

Back

Intersecting lines.

Front

What is the sum of angles in a triangle?

Back

180 degrees.

Front

What is a vertical angle?

Back

Angles that are opposite each other when two lines intersect.

Front

What is a transversal?

Back

A line that crosses at least two other lines.

Front

What are complementary angles?

Back

Two angles that add up to 90 degrees.