This week in Geometry, we started a new unit on trigonometry.  Using this trigonometry, we can find missing side lengths and angle measures in right triangles.  The trig functions that we use to do this are sine(sin), cosine(cos), and tangent(tan).  These functions are used in the following formulas: sinβ=opposite/hypotenuse, cosβ=adjacent/hypotenuse, and tanβ=opposite/adjacent.  Depending on what variables you have, you can rearrange these formulas to find any value in a right triangle.  There’s an easy way to remember these formulas, and that’s with the acronym: SOH CAH TOA!  Not only is it fun to say, but it can help you remember which function goes with which sides of the right triangle.  SOH stands for sine-opposite-hypotenuse, CAH stands for cosine-adjacent-hypotenuse, and TOA stands for tangent-opposite-adjacent.