Solution to "Circling the Square"
The actual answer is that you need FOUR circles to cover the square completely. But because it is so difficult to cut out the circles accurately enough to see the tiny gaps that appear, you can be happy if you answered three circles. But four is correct, and you can actually use a program like "GeoGebra" to solve it.
If you have never used Geogebra, go for it, and find that Maths is truly fun!