A protractor is a tool that allows you to measure an angle or construct an angle of a given measure.

- Skill level:
- Easy

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### Things you need

- Protractors
- Notebook Papers
- Pencils And Erasers

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## Instructions

- 1
Find the center hole on the straight edge of the protractor.

- 2
Place the hole over the vertex, or point, of the angle you wish to measure.

- 3
Line up the zero on the straight edge of the protractor with one of the sides of the angle.

- 4
Find the point where the second side of the angle intersects the curved edge of the protractor.

- 5
Read the number that is written on the protractor at the point of intersection. This is the measure of the angle in degrees.

- 1
Use the straight edge of the protractor to draw a straight line. This line will form one side of your angle.

- 2
Find the center hole on the straight edge of the protractor.

- 3
Place the hole over one end point of the line you have drawn.

- 4
Line up the zero on the straight edge of the protractor with the line.

- 5
Make a mark at the number on the curved edge of the protractor that corresponds to the desired measure of your angle. For example, mark at 90 for a 90-degree angle.

- 6
Use the straight edge of the protractor to connect the mark to the end point of the first line, forming an angle.

#### Tips and warnings

- There are 360 degrees in a circle.
- A straight line measures 180 degrees.
- The corner of a square measures 90 degrees. This is called a right angle.
- Angles that measure fewer than 90 degrees are called acute angles. Those measuring more than 90 degrees are called obtuse angles.