You may also like

Which Twin Is Older?

A simplified account of special relativity and the twins paradox.

Snookered

In a snooker game the brown ball was on the lip of the pocket but it could not be hit directly as the black ball was in the way. How could it be potted by playing the white ball off a cushion?

Spokes

Draw three equal line segments in a unit circle to divide the circle into four parts of equal area.

Scale Invariance

Age 16 to 18
Challenge Level

Peter Townsend succesfully solved this fascinating problem, providing us with one of the best solutions we've ever recieved. Awesome!









The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.
Copyright © 1997 - 2022. University of Cambridge. All rights reserved.
NRICH is part of the family of activities in the Millennium Mathematics Project.