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Playing with a Pentadecagon

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Author: Annie Fetter
Description: teacher support active problem Geometry, difficulty level 2. Extend the sides AB and ED of the regular pentadecagon ABCDEFGHIJKLMNO until they intersect. What is the measure of the angle at this intersection?
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Problem page: http://mathforum.org/librarypow/puzzles/index2.ehtml?puzzle=3015
Support page: http://mathforum.org/pow/support/geopow/20031117geo.teacher.html
Solution page: Problem #3015

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