Angle vocabulary

Front

What is an acute angle?

Back

An angle that measures less than 90°.

Front

What is a right angle?

Back

An angle that measures exactly 90°.

Front

What is an obtuse angle?

Back

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

Front

What is a straight angle?

Back

An angle that measures exactly 180°.

Front

What are vertical angles?

Back

Angles that are opposite each other when two lines intersect; they are always equal.

Front

What are alternate interior angles?

Back

Angles that are on opposite sides of a transversal and inside the two lines; they are equal when the lines are parallel.

Front

What are corresponding angles?

Back

Angles that are in the same position on two parallel lines in relation to a transversal; they are equal.

Front

What is a transversal?

Back

A line that crosses at least two other lines.

Front

If angle A is 30°, what type of angle is it?

Back

Acute angle.

Front

If angle B is 90°, what type of angle is it?

Back

Right angle.