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Round and Round a Circle

Can you explain what is happening and account for the values being displayed?

Sine and Cosine for Connected Angles

Stage: 4 Challenge Level: Challenge Level:2 Challenge Level:2
First check that you can find the size of every angle in the diagram.
Next use your knowledge of Sine or Cosine to find calculations for as many lengths as possible.

Remember this is a unit circle, the length $AO$ for example is $1$.
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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NRICH is part of the family of activities in the Millennium Mathematics Project.