lines and angles

Front

What are intersecting lines?

Back

Lines that cross each other at one point.

Front

What is an obtuse angle?

Back

An angle that measures more than 90 degrees but less than 180 degrees.

Front

What is an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.

Front

What are parallel lines?

Back

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

Front

What is the sum of angles on a straight line?

Back

180 degrees.

Front

What is the sum of angles in a triangle?

Back

180 degrees.

Front

What is a transversal line?

Back

A line that crosses two or more other lines.

Front

What are corresponding angles?

Back

Angles that are in the same position at each intersection where a transversal crosses two lines.

Front

What are alternate interior angles?

Back

Angles that are on opposite sides of the transversal and inside the two lines.