Copyright © University of Cambridge. All rights reserved.

'Inside Seven Squares' printed from http://nrich.maths.org/

Show menu


Seven squares are set inside each other. The centre points of each side of the outer square are joined to make a smaller square inside it and so on.



The centre square has the area of $1$ (one) square unit.

What is the total area of the four outside triangles which are outlined in red?

This problem is also available in French: Les 7 carrés

Click here for a poster of this problem.