Question

The diameter of a circle equals the radius of another circle. The ratio of their
areas is
(A) 1 : 2
(B) 1 : 3
(C) 1 : 4
(D) 1 : 8
(E) 1 : 16

Answer 1

@ganeshie8

Answer 2

\[\frac{A_1}{A_2} = \frac{\pi r_1^2}{\pi r_2^2}\]

\[2r_1=r_2\]

Answer 3

Thanks

Answer 4

\[\frac{A_1}{A_2} = \frac{r_1^2}{(2r)_1^2}\]