Interior and Exterior Angles of Triangles

Front

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

Back

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

Front

Define remote interior angles in relation to an exterior angle.

Back

Remote interior angles are the two interior angles of a triangle that are not adjacent to a given exterior angle.

Front

What is an exterior angle of a triangle?

Back

An exterior angle of a triangle is formed by one side of the triangle and the extension of an adjacent side.

Front

If one angle of a triangle measures 60 degrees and another measures 70 degrees, what is the measure of the third angle?

Back

The third angle measures 50 degrees (180 - 60 - 70 = 50).

Front

What is the relationship between an exterior angle and the remote interior angles?

Back

The measure of an exterior angle is equal to the sum of the measures of its remote interior angles.

Front

What is the definition of an interior angle?

Back

An interior angle is an angle formed by two sides of a triangle that meet at a vertex.

Front

If angle A is 40 degrees and angle B is 60 degrees, what is angle C in triangle ABC?

Back

Angle C is 80 degrees (180 - 40 - 60 = 80).

Front

What are corresponding angles?

Back

Corresponding angles are angles that are in the same position on different parallel lines cut by a transversal.

Front

How do you find the measure of an angle when given the measures of the other two angles in a triangle?

Back

Subtract the sum of the two known angles from 180 degrees.

Front

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

Back

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