Lines and Angles

Front

What is an acute angle?

Back

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

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 a straight angle?

Back

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

Front

What is the symbol for a line?

Back

Front

What is a vertex of an angle?

Back

The vertex of an angle is the point where the two rays meet.

Front

What is a right angle?

Back

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

Front

How do you identify an acute angle in a diagram?

Back

An acute angle is identified by its measure being less than 90 degrees, often appearing sharp or narrow.

Front

How do you identify an obtuse angle in a diagram?

Back

An obtuse angle is identified by its measure being more than 90 degrees but less than 180 degrees, appearing wider.

Front

What is the sum of angles in a triangle?

Back

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

Front

What are complementary angles?

Back

Complementary angles are two angles whose measures add up to 90 degrees.