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The coordinatea of A,B and C of the Delt...

The coordinatea of A,B and C of the `DeltaABC` are (3,1), (9,7) and (-3,7) respectively. If D,E and F are the mid-point of the sides `bar(BC),bar(CA)andbar(AB)` respectively, then find the area of the `DeltaDEF.` Also show that `DeltaABC=4DeltaDEF.`

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