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Geometry Warm-Up 2/6/12 The perimeter of a square is 20 inches. Find the length of a side on the square and the diagonal. 8-4: Trigonometry Geometry February 6, 2012 Trigonometry Trigonometry – study of triangle measurement 3 Common Trig Ratios Sine (sin) Cosine (cos) Tangent (tan) Trig Ratios The 3 trig ratios are all in reference to a specific angle. opposite Sin hypotenuse A x z adjacent Cos hypotenuse opposite Tan adjacent B C y Example 1 Find sin L, cos L, tan L, sin N, cos N, and tan N. Express each ratio as a fraction and as a decimal. “Gettin’ Triggy Wit It”