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| Heptatriangle (Posted on 2014-03-01) |
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Let the interior angles of ΔABC satisfy the following:
m(∠A) = 2*m(∠B) = 4*m(∠C).
If the bisectors of interior angles A, B, and C intersect
the opposite sides in points D, E, and F respectively,
prove that ΔDEF is isosceles.
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