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When you studied 45-45-90 and 30-60-90 triangles, you learned special vocabulary to refer to the different side lengths. For example, in a 30-60-90 triangle there is a short leg, long leg, and a hypotenuse.

Remember, all triangle with the same three angle measures will be similar and therefore have the same ratios of side lengths. For example, all triangles with a right angle and a 40^o will have the same ratio of opposite/hypotenuse. This means, the sine of that 40^o angle will always be the same.

Your calculator has been programmed to calculate the ratios of side lengths for the acute angles of all right triangles. Find the sin/cos/tan button(s) on your calculator.

Let's see if you found it. Sometimes it requires you to first push the "shift" or "2nd" key. Type in sin 40^o. Do you get 0.6427876? On the last few questions, you will be asked to find sin/cos/tan of angles.