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Inside Seven Squares

What is the total area of the four outside triangles which are outlined in red in this arrangement of squares inside each other?

Cutting Corners

Stage: 2 Challenge Level: Challenge Level:1

There are lots of answers to this problem, depending on what questions you choose to ask.

Have a go yourself, and if you discover anything interesting, e-mail us to tell us what you've done! Please don't worry that your solution is not "complete" - we'd like to hear about anything you have tried. Teachers - you might like to send in a summary of your children's work.