1. Point P is the midpoint of seg AB. Coordinates of P are (1,1) and A are (4,3). What are the coordinates of point B?
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By: anil on 05 May 2019 02.12 am
Coordinates of mid point of line joining A $$(x_1,y_1)$$ and B $$(x_2,y_2)$$ = $$(frac{x_1 + x_2}{2} , frac{y_1 + y_2}{2})$$ Let coordinates of B $$(x , y)$$ A = (4,3) and P = (1,1) => $$1 = frac{4 + x}{2}$$ => $$x = 2 - 4 = -2$$ Similarly, $$1 = frac{3 + y}{2}$$ => $$y = 2 - 3 = -1$$ Thus, coordinates of B (-2,-1)
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