Interior/Exterior Angles of Triangles

Front

What is an exterior angle of a triangle?

Back

An exterior angle is formed by one side of a triangle and the extension of an adjacent side. It is equal to the sum of the two remote interior angles.

Front

What does the Triangle Sum Theorem state?

Back

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

Front

If one angle of a triangle is 90° and another is 40°, what is the measure of the third angle?

Back

The third angle measures 50°.

Front

What is a remote interior angle?

Back

A remote interior angle is an interior angle of a triangle that is not adjacent to a given exterior angle.

Front

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

Back

To find the measure of an unknown angle, subtract the sum of the known angles from 180°.

Front

What is the relationship between corresponding angles when two parallel lines are cut by a transversal?

Back

Corresponding angles are equal when two parallel lines are cut by a transversal.

Front

If two angles of a triangle are 70° and 60°, what is the measure of the third angle?

Back

The third angle measures 50°.

Front

What is the definition of an interior angle?

Back

An interior angle is an angle formed inside a triangle by two sides.

Front

If an exterior angle measures 120°, what is the sum of the two remote interior angles?

Back

The sum of the two remote interior angles is 120°.

Front

What is the measure of an angle if the other two angles in a triangle are 30° and 60°?

Back

The measure of the angle is 90°.