Angle Addition Postulate Flashcard

Front

What is the Angle Addition Postulate?

Back

The Angle Addition Postulate states that if point D is in the interior of angle ABC, then m∠ABD + m∠DBC = m∠ABC.

Front

Calculate m∠ABC if m∠ABD = 45° and m∠DBC = 60°.

Back

m∠ABC = 105°.

Front

What is the measure of a straight angle?

Back

A straight angle measures 180°.

Front

If m∠RST = (12x - 1)° and m∠RSU = (9x - 15)°, what is the value of x if m∠UST = 53°?

Back

x = 13.

Front

What is the measure of a right angle?

Back

A right angle measures 90°.

Front

Back

m∠CBA = 2 * m∠ABD.

Front

Calculate m∠A if m∠B = 90° and m∠C = 65°.

Back

m∠A = 25°.

Front

What is the sum of the angles in a triangle?

Back

The sum of the angles in a triangle is always 180°.

Front

If m∠DEF = 180°, what type of angle is it?

Back

It is a straight angle.

Front

What is the formula to find the measure of an exterior angle of a triangle?

Back

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