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" na "Delta ABC" ,the midpoints of the s...

" na "Delta ABC" ,the midpoints of the sides "AB" ,BC and "CA" are respectively "(l,0,0),(0,m,0)" and "(0,0,0,

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In DeltaABC the mid points of the sides AB, BC and CA are (l, 0, 0), (0, m, 0) and (0, 0,n) respectively. Then, (AB^2+BC^2+CA^2)/(l^2+m^2+n^2) is equal to