Copyright © University of Cambridge. All rights reserved.

## 'The Pi Are Square' printed from http://nrich.maths.org/

A circle with the radius of 2.2 centimetres is drawn touching
the sides of a square. What area of the square is NOT covered by
the circle?

Hint: The formula for the area of a circle is r ^{2} which means (about)
3.14 times the radius, times the radius. (See Kids Mag to find more
about the special number called pi or