Question

Find the radius of a circle whose area is twice the area of a circle of radius 14

Answer 1

Area of circle having radius 14 =
$\pi \times {14}^{2} = 196\pi$
Double of 196π = 392π
Area of circle
$\pi {r}^{2} = 392\pi \\ {r}^{2} = 392 \\ r = 14 \sqrt{2}$