1. Point P is the midpoint of segment AB. Co-ordinates of P are (5,-4) and A are (7,0). What will be the co-ordinates of point B?
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By: anil on 05 May 2019 02.13 am
Coordinates of midpoint of line joining A = $$(x_1 , y_1)$$ and B = $$(x_2 , y_2)$$ is $$(frac{x_1 + x_2}{2} , frac{y_1 + y_2}{2})$$ P (5,-4) is mid point of A (7,0) and B (x,y) => $$5 = frac{x + 7}{2}$$ => $$x = 10 - 7 = 3$$ Similarly, $$-4 = frac{y + 0}{2}$$ => $$y = -8$$ $$ herefore$$ Coordinates of B = (3,-8)
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