Teaching sin and cosine instrument
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United States of America Patent
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Sep 13, 2005
Grant Date -
May 26, 2005
app pub date -
Nov 20, 2003
filing date -
Nov 20, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A device that teaches the relationship between a right triangle, the length of its hypotenuse, the length of its two sides and the trigonometric functions. The device includes a horizontal and vertical ruler attached by a sliding attachment bracket. A circular plate showing 360 degrees (θ) is attached to the horizontal ruler along with a pivoting ruler that can rotate 360 degrees. By sliding the vertical ruler along the horizontal ruler and revolving the pivoting ruler, the height of the vertical ruler (Y) where it intersects the pivoting ruler, the length of the horizontal ruler (X) where it intersects the vertical ruler, and the length of the of the pivoting ruler (R) where it intersects the vertical ruler can be measured. The trigonometric functions can then be calculated and plotted by their relationship with the measured values of X, Y, R and θ.
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