Question

Let $\Delta ABC\sim △DEF$ and their areas be, respectively.resp2ctively, 64${cm}^2$ and 121${cm}^2$ . If EF = $15.4cm,$ find $BC$

Answer 1

Since the triangles are similar ,

${\left(\frac{BC}{15.4}\right)}^2=\frac{64}{121}\frac{BC}{15.4}=\frac{8}{11}BC=\frac{8}{11}\times 15.4BC=8\times 2.2=11.2cm$