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December 18, 2014

December 18, 2014

Posted by **c** on Sunday, February 13, 2011 at 10:11pm.

- geometry -
**Reiny**, Sunday, February 13, 2011 at 10:22pmtake one of the right-angled triangles, call the base angle Ø

tanØ = 20/80 = 1/4

Ø = appr. 14.04°

can you take it from there?

I see pairs of isosceles triangles !

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