Flashcard Angles of Triangles

Front

What is the Triangle Sum Theorem?

Back

The Triangle Sum Theorem states that the sum of all angles in a triangle is 180°.

Front

If one angle of a triangle is 60° and another is 90°, what is the measure of the third angle?

Back

30°

Front

What is the measure of an angle that is supplementary to a 75° angle?

Back

105°

Front

What is the measure of an angle that is complementary to a 45° angle?

Back

45°

Front

In a triangle, if one angle measures 50° and another measures 60°, what is the measure of the third angle?

Back

70°

Front

If two angles of a triangle are equal and one measures 40°, what is the measure of each angle?

Back

40° each

Front

What is the definition of an acute angle?

Back

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

Front

What is the definition of an obtuse angle?

Back

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

Front

What is the definition of a right angle?

Back

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

Front

If the angles of a triangle are in the ratio 2:3:4, what are the measures of the angles?

Back

The angles are 40°, 60°, and 80°.