Angles and Triangle Sum Theorem

Front

What is the Triangle Sum Theorem?

Back

The Triangle Sum Theorem states that the sum of the interior angles of a triangle is always 180 degrees.

Front

If two angles are complementary, what is the sum of their measures?

Back

The sum of the measures of two complementary angles is 90 degrees.

Front

What is the measure of each angle in an equilateral triangle?

Back

Each angle in an equilateral triangle measures 60 degrees.

Front

How do you find the measure of a missing angle in a triangle?

Back

To find the measure of a missing angle in a triangle, subtract the sum of the known angles from 180 degrees.

Front

What is the measure of the third angle if two angles in a triangle are 50 degrees and 60 degrees?

Back

The measure of the third angle is 70 degrees (180 - (50 + 60)).

Front

If ∠A and ∠B are complementary and ∠A measures 45 degrees, what is ∠B?

Back

∠B measures 45 degrees (90 - 45).

Front

What is the measure of an angle that is supplementary to a 110 degree angle?

Back

The measure of the supplementary angle is 70 degrees (180 - 110).

Front

In a right triangle, what is the measure of the right angle?

Back

The measure of the right angle is always 90 degrees.

Front

If one angle of a triangle measures 30 degrees and another measures 50 degrees, what is the measure of the third angle?

Back

The third angle measures 100 degrees (180 - (30 + 50)).

Front

What is the relationship between the angles in a straight line?

Back

The angles on a straight line sum up to 180 degrees.