Question

In figure $1.13$ $BC\perp AB,AD\perp AB,BC=4,AD=8$, then find $\frac{A\left(△ABC\right)}{A\left(△ADB\right)}$.

Answer 1

REF.Image

$\frac{ar\left(\Delta ABC\right)}{ar\left(\Delta ADB\right)}$

$=\frac{\frac{1}{2}\times BC\times AB}{\frac{1}{2}\times AD\times AB}$

$=\frac{BC}{AD}=\frac{4}{8}=\frac{1}{2}$