Tricky Trig

This month's puzzle comes in two parts - find x, marked in red, in each of the following trig diagrams. They're not as easy as they look!

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You can send your solution by e-mail to plus@maths.cam.ac.uk.

If you are stumped by last issue's puzzle, here is the solution.

For some challenging mathematical puzzles, see the NRICH puzzles from this month or last month.