Measuring an Angle

Definition: To determine the measure an angle, a tool called a protractor can be used. Angles are measured in degrees (°).

Example: Find the measure of angle QRS:



We can use a protractor to find the measure of angle QRS.


Step 1: Place the midpoint of the protractor’s straight edge on the vertex of the angle.

Step 2: Because angle QRS is measured counterclockwise from the right, we will use the inner set of numbers to measure it.

Step 3: The degree value at which segment RQ intersects with the protractor’s units is the degree measure of the angle: The measure of angle QRS is 30 degrees.

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