# How to Use a Half-Circle Protracter by AB

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11 Steps
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1

Estimate whether the angle is an acute, obtuse, or right. You look at the arc to see what your considering.

2

The 0 degree mark to the 180 degree mark is called the baseline. The midline of the baseline is where you line up the vertex.

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3

Put the center of the protractor over the vertex of the angle and make sure that one side of the angle on the baseline

4

Find the place where the other side of the angle and make sure that the one side of the angle on the baseline.

5

Decide which of the 0 degree to the 180 degree scale to use. If the angle is an acute use the smaller side, it the angle is an obtuse than use the greater side.

6

Now we are going to draw angles

7

Draw a ray.

8

Place the center of the protractor at the end of the ray. Make sure the ray is aligned with the baseline of the protractor.

9

Use the scale that shows 0 degrees where the ray crosses the end of the protractor.

10

Draw a dot where the other ray should cross the edge of the protractor.

11

Draw a ray from the vertex through the dot.

### Supplies

 Paper Pencil Half-circle protractor
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