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Can you sketch this tricky trig function?

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Stadium Sightline

How would you design the tiering of seats in a stadium so that all spectators have a good view?

Geometric Trig

Stage: 5 Short Challenge Level: Challenge Level:1

This problem uses basic notions of trigonometry and areas of triangles which are fundamental to developments in A-level mathematics.
Being able to work with diagrams such as this is useful prepation for both coordinate geometry and mechanics.