Answers

2014-07-22T09:27:47+05:30
Area of square = d square/2   (d = diagonal )
               4      =  d square/2
               8      = d square
     d = root 8

area of circle =  pie r square

                  = 22/7 * root 8 square
                  =22/7 * 8
                  =176/7
                  =29.3333
 













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Instead of radius, you have considered diameter to find the area of the circle.
that was root 8square
2014-07-22T09:47:33+05:30
As area of circle = π r^{2}  
           nd the diagonal of square formula  = √2a
we know that side =2
so the diagonal =2√2
and the formula of circle =πr²
substitute and ans is 25.12
1 5 1