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How to use a protractor to measure & draw angles

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Published on Jan 10, 2012

I explain what an angle measure is, how to measure angles with a protractor, and how to draw angles with a protractor.

When an angle "opens", it draws an arc of a circle, and we compare that arc to the full circle, which is 360 degrees.

Using a protractor is fairly straight-forward. You line up one side of your angle with the protractor's "zero-line" and you place the midpoint of the protractor to the vertex of the angle. Then you read the angle measure where the other side of the angle touches the half-circle of the protractor. But you need to place the protractor right.

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