Unit 7, Lesson 2
Adjacent Angles
Grade 7
2.1
Warm-up
Estimating Angle Measures
Estimate the degree measure of each indicated angle.
Sign in to view assessments and invite other educators
Sign in using your existing Kendall Hunt account. If you don’t have one, create an educator account.
Estimate the degree measure of each indicated angle.
Your teacher will give you two small, rectangular papers.
On the paper with a half-circle along one side, draw and cut a straight line that starts at the center of the half-circle and goes all the way across the paper, making 2 separate pieces. On each of these two pieces, measure the angle that is marked by the arc created by part of a circle. Label the angle measure on the piece.
On the rectangular paper with a quarter-circle in one of the corners, follow the same instructions as you cut, measure, and label the two angles marked by the arc created by part of a circle.
Record your group’s measurements in the table:
| angles making a side | angles making a corner |
|---|---|
A protractor is shown. Point C is on the center of the protractor. Segment B, A lies along the 0 or 180 line, segment C D lies along the 90 degree line. Segment A, C goes through the 30 or 130 line. Points A and B are connected, and points A and D are connected.
Explain how to find the measure of angle
Use the protractor in the picture to find the measure of angles
Explain how to find the measure of angle
Angle
Point
If two angle measures add up to
If two angle measures add up to
Complementary angles have measures that add up to 90
For example, a
Supplementary angles have measures that add up to 180
For example, a