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

If m∠A = 25° and m∠B = 35°, what is m∠C if ∠A and ∠B are adjacent and form ∠C?

Back

m∠C = m∠A + m∠B = 25° + 35° = 60°.

Front

What is the measure of a right angle?

Back

A right angle measures 90 degrees.

Front

If m∠K + m∠L = 90°, what type of angles are ∠K and ∠L?

Back

∠K and ∠L are complementary angles.

Front

Calculate m∠DEF if m∠D = 60° and m∠E = 120°.

Back

m∠DEF = m∠D + m∠E = 60° + 120° = 180°.

Front

What is the relationship between angles that are supplementary?

Back

Two angles are supplementary if the sum of their measures is 180 degrees.

Front

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

Back

x = 13.

Front

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

Back

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

Front

If m∠A = 30° and m∠B = 60°, what is m∠C in triangle ABC?

Back

m∠C = 180° - (m∠A + m∠B) = 180° - (30° + 60°) = 90°.

Front

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

Back

∠H can also be referred to as ∠KGH or ∠LGH.