Learn how to use a protractor when measuring math angles.
An angle is formed by two rays with a common endpoint called the vertex. The most common unit used when measuring angles is the degree.
Follow these easy steps when using a protractor to measure angles:
1) Place the center of the protractor on the angle's vertex.
2) Rotate the protractor so that the straightedge is placed over one of the angle's sides.
3) Use the scale that begins with zero. Read where the other side of the angle crosses this scale.
Angles can be classified based on their measure.
An acute angle measures between 0 and 90 degrees.
A right angle measures 90 degrees.
An obtuse angle measures between 90 and 180 degrees.
A straight angle measures 180 degrees.
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