## Trigonometry (10th Edition)

$a=6; b=7.5$
1. Because we have isosceles triangles, here, so it is easy to see that a=6 2. Make following three equivalent ratios $\frac{6}{12} =\frac{1}{2} =\frac{b}{15}$ 3.Then find the side b $\frac{1}{2} =\frac{b}{15}$ $2b=15$ $b=7.5$