1.4 Measure and Classify Angles
An angle consists of two different
rays with the same endpoint.
The rays are the sides of the
angle. The endpoint is the
vertex of the angle.
The angle with sides (ray) AB
and (ray) AC can be named
<BAC , <CAB, or <A.
1.4 Measure and Classify Angles
Example 1: Name Angles
Name three angles is the diagram:
1.4 Measure and Classify Angles
Example 2: Name Angles
Name three angles in the diagram:
1.4 Measure and Classify Angles
1.4 Measure and Classify Angles
Angles can be classified as acute, right,
obtuse, and straight.
Draw an example:
Acute
Right
Obtuse
Straight
1.4 Measure and Classify Angles
Example 3: Use the diagram to find the
measure of the indicated angle. Then
classify the angle.
a. <KHJ
b. <GHK
c. <GHJ
d. <GHL
1.4 Measure and Classify Angles
Angle Addition Postulate
1.4 Measure and Classify Angles
Example 4: Given the <LKN = 145
degrees, find m<LKM and m<MKN
1.4 Measure and Classify Angles
Example 5: Given the <XYZ = 72 degrees,
find m<XYW and m<ZYW
1.4 Measure and Classify Angles
Congruent Angles: Two angles are
congruent angles if they have the exact
same measure.
1.4 Measure and Classify Angles