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Cosine, Sine
By now, you're probably familiar with the 3 main ratios used within right-triangle trigonometry. If angle A is an acute angle of any RIGHT TRIANGLE, then you've already learned that: sine of A = leg opposite A / hypotenuse cosine of A = leg adjacent A / hypotenuse tangent of A = leg opposite A / leg adjacent A The applet below depicts the TRUE MEANINGS of the 3 main trigonometric ratios when used in the context of a right triangle. Interact with the applet below for a few minutes and then answer the questions that follow.