If P(1,\ 2),\ \ Q(1,\ 0) and R(0,\ 1) ar...

If `P(1,\ 2),\ \ Q(1,\ 0)` and `R(0,\ 1)` are the mid-points of the sides `A B ,\ B C` and `A C` respectively of ` A B C` , find the coordinates of the vertices `A ,\ B` and `C` , and hence find the area of ` A B C` .

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