8.5 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 the measure of angle AOB plus the measure of angle BOC equals the measure of angle AOC.

Front

What is a right angle?

Back

A right angle is an angle that measures exactly 90 degrees.

Front

What is a straight angle?

Back

A straight angle is an angle that measures exactly 180 degrees.

Front

How do you find the measure of an angle when given two other angles?

Back

You can use the Angle Addition Postulate to find the measure of an angle by adding the measures of the two known angles.

Front

If angle ECD measures 122 degrees and angle BCE measures 36 degrees, how do you find angle BCD?

Back

You can find angle BCD by using the Angle Addition Postulate: angle BCD = angle ECD + angle BCE = 122 degrees + 36 degrees = 158 degrees.

Front

What is the sum of the angles in a straight line?

Back

The sum of the angles on a straight line is 180 degrees.

Front

What is the measure of angle ABC if it is given as 105 degrees?

Back

The measure of angle ABC is 105 degrees.

Front

What is the relationship between complementary angles?

Back

Complementary angles are two angles whose measures add up to 90 degrees.

Front

What is the relationship between supplementary angles?

Back

Supplementary angles are two angles whose measures add up to 180 degrees.

Front

How do you solve for x in an equation involving angles?

Back

To solve for x in an equation involving angles, isolate x on one side of the equation using algebraic methods.