Blue and white

Identical squares of side one unit contain some circles shaded blue. In which of the four examples is the shaded area greatest?

Problem

Blue and White printable sheet

 

In the examples below identical squares of side one unit contain some circles shaded blue.

 

 

Image
4 unit squares, each of which has 1, 4, 9, 16 smaller circles of equal sizes.



In which of the four examples is the shaded area greatest?

 

This problem is also available in French: Bleu et Blanc