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given EAD = 15 degrees

ADE = 15 degrees

its a 10 by 10 square

you can only use geometry to solve this problem, NO TRIGONOMETRY. Supposedly it can be done...I've been trying!!

3. The attempt at a solution

angle ABC = angle DCE by symmetry

angle EBC = angle ECB by symmetry

angle ABC + angle EBC = angle DCE + angle ECB = 90 degrees

angle AEB = 75 degrees = DEC

angle AED = 150 degrees

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# Simple geometry problem but only using geometry

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