Classifying angles

Front

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

Back

Right angle (90 degrees)

Front

What is an angle that measures less than 90 degrees called?

Back

Acute angle

Front

What is an angle that measures more than 90 degrees but less than 180 degrees called?

Back

Obtuse angle

Front

What type of angle measures exactly 180 degrees?

Back

Straight angle

Front

What is the sum of the angles in a triangle?

Back

180 degrees

Front

If one angle is 30 degrees, what is the measure of its complementary angle?

Back

60 degrees (90 - 30 = 60)

Front

If one angle is 120 degrees, what is the measure of its supplementary angle?

Back

60 degrees (180 - 120 = 60)

Front

What do you call an angle that measures exactly 90 degrees?

Back

Right angle

Front

What type of angle is formed by the hands of a clock at 3:00?

Back

Right angle

Front

What is the relationship between acute angles and right angles?

Back

Acute angles are less than right angles.