Geometrical Puzzle 3

Keep in shape with a geometric conundrum.

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Circular thinking

Look at that square, lording it over the circles clustered around it. Size-wise, one of those circles could just about fit inside the square, touching all four of the walls. But how many circles would it take to completely cover the square?
Circular thinking

Only four circles would be required. It's definitely improved your life knowing that, right?

These shapes look completely different, don't they...?

Circular thinking