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Round and Round a Circle

Age 14 to 16
Challenge Level Yellow star
  • Interactive environment
  • Getting Started
  • Teachers' Resources


Watch the animation.
Can you explain what is happening?
What do you notice about the numbers that appear towards the end of the sequence?
Can you explain how they vary and why?
What would happen if the dot kept going around the circle increasing the angle beyond 360 degrees?



 

 

 

 

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Three points A, B and C lie in this order on a line, and P is any point in the plane. Use the Cosine Rule to prove the following statement.

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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.

NRICH is part of the family of activities in the Millennium Mathematics Project.

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