A CIRCLE OF RADIUS X HAS AN AREA TWICE THAT OF A SQUARE OF SIDE A....

31. A circle of radius x has an area twice that of a square of side a. The equation used to find the radius ofthe circle is(A) πa

²

= 2x

²

(B) πx

²

= 2a

²

(C) πx

²

= 4a

²

(D) πa

²

= 4x

²

(E) 4πx

²

= a

²