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Protractor
A protractor is a tool used to measure angles
A protractor is a transparent plastic tool designed to measure angles. They are usually semicircular but also are available in a full circle 360° version.
| Origin |
The small hole near the bottom of the protractor is aligned over the
vertex of the angle to be measured.
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| Baseline |
The line along the bottom of the protractor is aligned along one of the angle's legs.
Note: It is not the edge of the protractor body itself, but parallel to it.
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| Scales |
The angle of the other leg is read from one of the two scales, whichever is more convenient.
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For an animated demonstration of using the protractor see Using a Protractor
Related angle topics
General
Angle Types
Angle relationships
(C) 2008 Copyright John Page
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