Krishna
0

Step 1: Recall the \sin formula

             FORMULA: If θ is one of the acute angles in a triangle, then the sine of

             theta is the ratio of the opposite side(opp) to the hypotenuse(hyp).

                =   \frac{opp}{hyp}


Step 2: Plug in the relevant side lengths.

            EXAMPLE: From triangle EDC

                                Opposite side to angle D = EC

                                Hyp  = DC

                        \Rightarrow   \frac{EC}{DC}

                        \Rightarrow   \frac{72}{97}