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WHEN YOU WORK WITH ANGLES IN ALL FOUR QUADRANTS, THE TRIG RATIOS FOR THOSE ANGLES ARE COMPUTED IN TERMS OF THE VALUES OF X, Y, AND R, WHERE R IS THE RADIUS OF THE CIRCLE THAT CORRESPONDS TO THE HYPOTENUSE OF THE RIGHT TRIANGLE FOR YOUR ANGLE.
 

Any two right triangles with the same base angle θ ("theta")will be similar in the technical sense of having their sides in proportion. This similarity is more obvious when when the triangles are nested

Created by Megan Ulrichs

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