Interior/Exterior Angles of Triangles

Front

What is the Triangle Sum Theorem?

Back

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

Front

What are interior angles of a triangle?

Back

Interior angles are the angles formed inside a triangle by its sides.

Front

What are exterior angles of a triangle?

Back

Exterior angles are the angles formed outside a triangle when one side is extended.

Front

If one angle of a triangle is 90°, what can you say about the other two angles?

Back

The other two angles must sum to 90° because the total must equal 180°.

Front

What are remote interior angles?

Back

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

Front

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

Back

Subtract the sum of the known angles from 180°.

Front

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

Back

An exterior angle is equal to the sum of the two remote interior angles.

Front

If angle A = 50° and angle B = 60°, what is angle C?

Back

Angle C = 180° - (50° + 60°) = 70°.

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 definition of corresponding angles?

Back

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