Sorry unsure where to put this.

Not sure if I should draw it out... I'll try to explain...

There is a circle. It has a radius of 10pi

There are four equal circles within the circles, taking up the exact same space and such, just at the four quarters of the circle.

If you imagine it, in the middle between these 4 circles is a diamond shaped thingy.

What is the area of the largest circle than can fit in there?

The answer is triple square route of 25pi but how does that work? And why?