Circles Solved Questions Page-3

17) If A is the area of circle, which of the following is an expression for A in terms of C?
(A) C2/4π
(B) C2/4π2
(C) 2C
(D) 2C2π

18) What is the area of a circle whose radius is the diagonal of a square whose area is 4?
(A) 2π
(B) 2π√2
(C) 4π
(D) 8π