Classifying Angles

Front

What is an acute angle?

Back

An angle that measures less than 90 degrees.

Front

What is an obtuse angle?

Back

An angle that measures greater than 90 degrees but less than 180 degrees.

Front

What is a right angle?

Back

An angle that measures exactly 90 degrees.

Front

What is a straight angle?

Back

An angle that measures exactly 180 degrees.

Front

What is the sum of angles in a triangle?

Back

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

Front

If m∠A = (5x + 25)° and x = 7, what is m∠A?

Back

60°

Front

What type of angle has a measurement of 25°?

Back

Acute angle.

Front

What type of angle has a measurement of 90°?

Back

Right angle.

Front

What type of angle has a measurement of 150°?

Back

Obtuse angle.

Front

What is the definition of complementary angles?

Back

Two angles that add up to 90 degrees.