Angle Relationships and Triangles

Front

What is the sum of the interior angles of a triangle?

Back

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

Front

What do you call an angle that measures less than 90 degrees?

Back

An angle that measures less than 90 degrees is called an acute angle.

Front

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

Back

An angle that measures exactly 90 degrees is called a right angle.

Front

What do you call an angle that measures more than 90 degrees but less than 180 degrees?

Back

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

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

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

Back

The sum of the measures of two supplementary angles is 180 degrees.

Front

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

Back

Each angle in an equilateral triangle measures 60 degrees.

Front

What is the relationship between the angles in a right triangle?

Back

In a right triangle, one angle measures 90 degrees, and the sum of the other two angles is 90 degrees.

Front

What is the formula for finding the measure of an exterior angle of a triangle?

Back

The measure of an exterior angle of a triangle is equal to the sum of the measures of the two opposite interior angles.

Front

What is the term for angles that are opposite each other when two lines intersect?

Back

Angles that are opposite each other when two lines intersect are called vertical angles.