if there is a right triangle ABC and the tangent B is 8/15 what is the cosine of A
+33654 The tangent is opposite over adjacent, so if we let opposite be 8 and adjacent be 15 then the hypotenuse is
√82+152=17
cosine is adjacent over hypotenuse, so cos(B) = 15/17. Angle A must be the other angle (not the right-angle) so we must have cos(A) = 8/17.
Even if the sides are not actually 8, 15 and 17 they must all be a scale factor times those values. The scale factor will cancel out of the ratios when determining cos, sin and tan.
+33654 The tangent is opposite over adjacent, so if we let opposite be 8 and adjacent be 15 then the hypotenuse is
√82+152=17
cosine is adjacent over hypotenuse, so cos(B) = 15/17. Angle A must be the other angle (not the right-angle) so we must have cos(A) = 8/17.
Even if the sides are not actually 8, 15 and 17 they must all be a scale factor times those values. The scale factor will cancel out of the ratios when determining cos, sin and tan.
