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Pent

The diagram shows a regular pentagon with sides of unit length. Find all the angles in the diagram. Prove that the quadrilateral shown in red is a rhombus.

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Weekly Problem 52 - 2006

Weekly problem 52 - 2006

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Tuning and Ratio

Why is the modern piano tuned using an equal tempered scale and what has this got to do with logarithms?

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. More information on many of our other activities can be found here.
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