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Download Geometry, 9.9: Intro to Trigonometry (Sine, Cosine, Tangent)
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Transcript
Geometry, 9.9: Intro to Trigonometry (Sine, Cosine, Tangent) For a right triangle, given one of the non-right angles, each side has a 'name': We know two special triangle 'patterns': 45-45 triangles... 30-60 triangles... Ratio of opposite side to hypotenuse: Ratio of adjacent side to hypotenuse: Ratio of opposite side to adjacent side: The ratio depends on the angle, but not on the size of the triangle. These ratios are called trigonometric ratios: To help remember: opposite sine of ∠A = sin A = hypotenuse cosine of ∠A = cos A = adjacent hypotenuse tangent of ∠A = tan A = opposite adjacent
