show that area of the triangle DEF is one-fourth of the area of triangle ABC
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no idea sorry.............
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in triangle ABC
angle ADE forms 45⁰
angle BDE also form 45⁰
it means D is the mid point of AB
same goes with all the side of triangle ABC which gives D, E, F are mid point of AB BC and CD.
therefore triangle DEF IS one fourth of the area of triangle abc
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