1.4 Angles and their Measures

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1.4 Angles and their Measures
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Angles
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 CAB
angle BAC
angle A
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Naming Angles
How many angles do you see?
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Three angles!
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Adjacent Angles
PQS and SQR are adjacent.
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Interior vs. Exterior
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Measuring Angles

• A protractor is used to find the measure of an
  angle.

The measure of angle BAC is 50 degrees.
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Angle Addition Postulate


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A
B
Two angles are congruent if and only if they
have the same measure
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Classifying Angles
classification
example
measure range
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