Missing Angles in Triangle

Front

What is the sum of the angles in a triangle?

Back

180°

Front

Find the measure of the missing angle if one angle is 60° and another is 80°.

Back

40°

Front

What is an 'Obtuse' Angle?

Back

An angle that measures more than 90° but less than 180°.

Front

Find the measure of the missing angle if one angle is 90° and another is 45°.

Back

45°

Front

What is an 'Acute' Angle?

Back

An angle that measures less than 90°.

Front

Find the measure of the missing angle if one angle is 70° and another is 50°.

Back

60°

Front

What is a 'Right' Angle?

Back

An angle that measures exactly 90°.

Front

Find the measure of the missing angle if one angle is 30° and another is 120°.

Back

30°

Front

What is the relationship between the angles in a triangle?

Back

The sum of the three angles must equal 180°.

Front

Find the measure of the missing angle if one angle is 100° and another is 30°.

Back

50°