first draw a circle with center o whose diameter is less than 10 them bisect the radius now extend the bisected line at the point at which it cuts the perimeter of the circle let that point name be A and B now measure the length of A and B and this would the side of the square whose area ia equal to that of circle.
now for the circle whose diameter is more than or equal to 10.
1)draw a circle with center o with diameter more than 10
2)bisect its radius
3)at what point the bisected line segment cut the radius line let it be p
4)now bisect p and o
5)let the bisected point between p and o be q
6) now bisect q and p
7)let the point be r
8)extend the line segment r
9)now at the points at which it cuts the circle measure the length of line segment
10)this length would be equal to side of the square whose area is equal to the circle
........ research by **AV**