Area of a circle

Area of a circle:

[pi]r2

r2 --- diagonal=[squareroot]2r2

[squareroot]2r2 squared = 2r2


IMagine a circle with r=1

Area of circle=[pi]

area of inner circle=2r2 or 2(1)2 or 2

so, ratio of thew areas of circle to inner square = [pi] to 2