Triangle Sum & Exterior Angle Theorems

Front

What is the Triangle Sum Theorem?

Back

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

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

State the Exterior Angle Theorem.

Back

The Exterior Angle Theorem states that the measure of an exterior angle is equal to the sum of the measures of the two remote interior angles.

Front

What is an Acute Angle?

Back

An Acute Angle is an angle that measures less than 90 degrees.

Front

What is a Right Angle?

Back

A Right Angle is an angle that measures exactly 90 degrees.

Front

What is an Obtuse Angle?

Back

An Obtuse Angle is an angle that measures more than 90 degrees but less than 180 degrees.

Front

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

Back

To find the measure of an unknown angle in a triangle, subtract the sum of the known angles from 180 degrees.

Front

If one angle of a triangle is 50° and another is 60°, what is the third angle?

Back

The third angle is 70°, calculated as 180° - (50° + 60°).

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

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.