What is the circumference of circular region R?
(1) The area of R is 36 pi.
(2) The area of a square region inscribed in R is 72.
(1) The area of R is 36 pi.
(2) The area of a square region inscribed in R is 72.
before i begin the solution, a very useful,general tip for DS ; ALWAYS write simplified DS question with constraints.
you need to find circumference=2*pi*R or i can say you need "R"
i) Area=pi*R*R=36pi...... so you can find R (suff.)
ii) Area of square region in circle=72
diagonal of square will be diameter because angle drawn from 2 end-points of a diameter make 90 degrees angle on the circle. since diagonalof square=2R.. you can find side of square and hence area of square in terms of R. That means you can find R.(suff.)
Ans = D
