Using the protractor

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How to measure an angle using the protractor

Note the sequence:

The center O The protractor should be placed over the vertex of the angle.
The horizontal line through the center must coincide with one of the right angles .
We check the measure of the scale in which passes the other semi-straight .

Observe the sequence used to construct an angle of 50º:

We place the center of the protractor over the origin of the straight (A).
We identified on the protractor the point (C) corresponding to the 50º measurement.