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Choose any three by three square of dates on a calendar page...

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Building Tetrahedra

Can you make a tetrahedron whose faces all have the same perimeter?

Circumference and Diameter

Stage: 3 and 4 Short Challenge Level: Challenge Level:1

The formula which gives in terms of is $C= \pi \times d$ , so the graph of C versus d is a straight line which passes through the origin.

This problem is taken from the UKMT Mathematical Challenges.
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