Triangles Sum Theorem & Exterior Angle Theorem

Front

What does the Triangle Sum Theorem state?

Back

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

Front

If two angles of a triangle are 30° and 70°, what is the measure of the third angle?

Back

The third angle measures 80°.

Front

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

Back

Each angle in an equilateral triangle measures 60°.

Front

What is the Exterior Angle Theorem?

Back

The Exterior Angle Theorem states that the measure of an exterior angle of a triangle is equal to the sum of the measures of the two non-adjacent interior angles.

Front

What are right angles?

Back

Right angles are angles that measure exactly 90 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 relationship between the angles in a triangle and the exterior angle?

Back

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

Front

If one angle of a triangle is 90°, what type of triangle is it?

Back

It is a right triangle.

Front

What is the sum of the angles in any triangle?

Back

The sum of the angles in any triangle is 180 degrees.

Front

What is the measure of an angle that is complementary to a 41° angle?

Back

The measure of the complementary angle is 49°.