1.4 Angles and their Measures. “angle CAB”“angle BAC” You can use the vertex of an angle to name it… Or, you can use 3 points on the angle with the vertex.

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Presentation transcript:

1.4 Angles and their Measures

“angle CAB”“angle BAC” You can use the vertex of an angle to name it… Or, you can use 3 points on the angle with the vertex in the middle… “angle A”

Naming Angles How many angles do you see?

Three angles!

PQS and SQR are adjacent. Adjacent Angles

Interior vs. Exterior

Measuring Angles A protractor is used to find the measure of an angle. “The measure of angle BAC is 50 degrees.”

Angle Addition Postulate +=

AB “Two angles are congruent if and only if they have the same measure”

Classifying Angles classification examplemeasure range