A quadrilateral has four sides with lengths, two diagonals with lengths, four inside angles,
four outside angles, and an area. The angles are the only things you can measure with
a protractor.
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A protractor is used to measure angles.
A protractor is an instrument that is used when you need to measure an angle.
A protractor is a geometric tool that is used to measure the degree of angles.
I used a protractor to find the measure of the angle.
Protractor