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Is the triangle a right triangle? YES Does the right triangle have an altitude cutting across it? YES Geometric Mean     NO NO Do you know a side and its opposite angle? YES Law of Sines Do you know at least one angle measure? YES Are one of these angles measured 30, 45, or 60 degrees? YES Special Right Triangles NO NO NO Law of Cosines   Pythagorean Theorem Trig ratios (soh cah toa)