Foldung can be done in two ways.
1.Folding length wise.
thus circumference of cirlce become the length and height become breadth
I.e 2πr=l and h=b
r=(l÷2π)
2.Folding breadthwise
thus circumference of circle become breadth and height become length
i.e 2πr=b and h=l
r=b÷2π
Like if satisfied