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Topic: Geometric problem
Replies: 11   Last Post: Aug 12, 2013 3:01 AM

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William Elliot

Posts: 2,637
Registered: 1/8/12
Geometric problem
Posted: Jul 29, 2013 3:38 AM
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> ABC is an equilateral triangle.on BC side we build BDC triangle such
> that <BDC = 30.from the vertex A we construct a 30 degree angle such
> that each ray intersects the sides DB and DC of triangle BDC in the
> points E and F respectively, i.e <EAF = 30.
> How we prove that: BE^2 + CF^2 = EF^2 ?


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