Stage: 5 Challenge Level: 
Bricks are 20cm long and 10cm high. If you built a tower of single bricks without using mortar on a flat horizontal surface, how tall would the tower have to be for it to overhang by 1 metre? How big an overhang is it possible to make like this?
Geometric sequence. Mathematical induction. Mathematical reasoning & proof. Making and proving conjectures. Moment of a force. Centre of mass. Summation of series. Mathematical modelling. Real world. Generalising.
Published January 2000.
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