## Trigonometry (10th Edition)

1. This is the ratio of the two shortest sides of the similar triangle. Reduced to make easier to solve equations $\frac{4}{400}=\frac{1}{100}$ 2. Then construct all three ratios to find unknown sides $\frac{1}{100}=\frac{5}{a}=\frac{7}{b}$ 3. Cross-multiplication --> Solutions : a= 500 b= 700