Patent ID: 6941667

Claim:
A device for demonstrating the relationship between a right triangle, its sides, angles, and trigonometric functions, said device comprising: a horizontal ruler having a left portion with measuring indicia and a right portion with measuring indicia, a circular plate showing 360 degrees of the circle being attached to the horizontal ruler at an intersection of said left and right portions of said horizontal ruler; a vertical ruler having an upper portion with measuring indicia and a lower portion with measuring indicia, a sliding attachment bracket being attached to the vertical ruler at an intersection of the upper and lower portions, said sliding attachment maintaining said vertical ruler at a right angle to said horizontal ruler and allows said vertical ruler to be slidably moved to said left and right portions of said horizontal ruler; a pivoting ruler having measuring indicia and an end rotatably attached at said intersection of said horizontal ruler such that the pivoting ruler can rotate 360 degrees; wherein said pivoting ruler can rotate to different angles using a set increment of degrees all the way around the circle and wherein said vertical ruler can be moved to intersect the pivoting ruler at a location along said pivoting ruler other than at said end of said pivoting ruler.