Lines and Angles

Front

What is an angle whose measure is exactly 90 degrees?

Back

Right angle

Front

What do you call an angle that measures less than 90 degrees?

Back

Acute angle

Front

What are lines that cross but do not form right angles called?

Back

Intersecting lines

Front

What do you call an angle that is greater than 90 degrees?

Back

Obtuse angle

Front

What type of angle measures exactly 180 degrees?

Back

Straight angle

Front

What is the term for angles that are equal in measure?

Back

Congruent angles

Front

What do you call two lines that never meet?

Back

Parallel lines

Front

What is the name of an angle that measures exactly 0 degrees?

Back

Zero angle

Front

What type of angle is formed when two lines intersect at a right angle?

Back

Perpendicular angles

Front

What is the sum of angles in a triangle?

Back

180 degrees