Angle Addition Postulate

Front

What is the Angle Addition Postulate?

Back

The Angle Addition Postulate states that if point B is in the interior of angle AOC, then m∠AOB + m∠BOC = m∠AOC.

Front

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

Back

m∠ABC = m∠ABD + m∠DBC = 60° + 45° = 105°.

Front

If m∠A + m∠B = 90°, what type of angles are A and B?

Back

A and B are complementary angles.

Front

What is the measure of a right angle?

Back

A right angle measures 90°.

Front

If m∠RST = (12x - 1)° and m∠RSU = (9x - 15)°, and m∠UST = 53°, find x.

Back

x = 13.

Front

What is another name for ∠H if it is formed by points K, G, and H?

Back

∠LHG.

Front

Calculate m∠DEF if it is a straight angle.

Back

m∠DEF = 180°.

Front

If two angles are supplementary, what is the sum of their measures?

Back

The sum of their measures is 180°.

Front

What is the relationship between complementary angles?

Back

Complementary angles add up to 90°.

Front

If m∠A = 25°, what is m∠B if ∠A and ∠B are complementary?

Back

m∠B = 90° - m∠A = 90° - 25° = 65°.