Protractor with an auxiliary ruler
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United States of America Patent
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Oct 1, 2002
Grant Date -
N/A
app pub date -
Jul 12, 2001
filing date -
Jul 12, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A semi-circular protractor is provided at a center of circle with a through hole to which an auxiliary ruler having a length close to a diameter of the protractor is detachably and rotatably attached. With the auxiliary ruler, the protractor may be used to measure angles on a plane and on a three-dimensional body and to draw different angles. The protractor with the auxiliary ruler is designed for children to more easily understand the meaning of 'angle' and to learn to use angles.
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