Angles and Lines

Front

What is an obtuse angle?

Back

An obtuse angle is an angle that is greater than 90 degrees but less than 180 degrees.

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

What is an acute angle?

Back

An acute angle is an angle that is less than 90 degrees.

Front

What are parallel lines?

Back

Parallel lines are lines that never meet and are always the same distance apart.

Front

What are perpendicular lines?

Back

Perpendicular lines are lines that intersect at a right angle (90 degrees).

Front

How many degrees are in a straight angle?

Back

A straight angle measures exactly 180 degrees.

Front

What is the sum of angles in a triangle?

Back

The sum of the angles in a triangle is always 180 degrees.

Front

What is a transversal line?

Back

A transversal line is a line that crosses two or more other lines.

Front

What is the relationship between alternate interior angles when two lines are parallel?

Back

Alternate interior angles are equal when two parallel lines are cut by a transversal.

Front

What is the relationship between corresponding angles when two lines are parallel?

Back

Corresponding angles are equal when two parallel lines are cut by a transversal.