Lines and Angles

Front

What are perpendicular lines?

Back

Perpendicular lines are lines that intersect to form right angles (90 degrees).

Front

What type of angle is formed by two perpendicular lines?

Back

A right angle.

Front

What is an obtuse angle?

Back

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

Front

What is an acute angle?

Back

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

Front

What is a straight angle?

Back

A straight angle is an angle that measures exactly 180 degrees.

Front

What is a reflex angle?

Back

A reflex angle is an angle that measures more than 180 degrees but less than 360 degrees.

Front

How can you identify a right angle?

Back

A right angle can be identified by its 90-degree measurement, often marked with a small square in the corner.

Front

What is the sum of angles in a triangle?

Back

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

Front

What do you call two angles that add up to 90 degrees?

Back

Complementary angles.

Front

What do you call two angles that add up to 180 degrees?

Back

Supplementary angles.