Estimate the degree measure of each indicated angle.

Your teacher will give you two small, rectangular papers.

1. 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.

   

2. 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.

   

3. Record your group’s measurements in the table:

   angles making a side	angles making a corner

4. What do you notice about these angle measures?
5. For the angles making a side of the rectangle, Clare measured 70 degrees on one of her pieces. Predict the angle measure of her other piece.
6. For the angles making a corner of the rectangle, Priya measured 53 degrees on one of her pieces. Predict the angle measure of her other piece.

1. Use the protractor in the picture to find the measure of angles and .

   

   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.

2. Explain how to find the measure of angle without repositioning the protractor.

3. Use the protractor in the picture to find the measure of angles and .

   

4. Explain how to find the measure of angle without repositioning the protractor.

5. Angle is a right angle. Find the measure of angle .

   

6. Point is on line . Find the measure of angle .