Q15 of 77 Page 7

Find the coordinates of the point where the diagonals of the parallelogram formed by joining the points ( - 2, - 1), (1, 0), (4, 3) and (1, 2) meet.

Given: points ( - 2, - 1), (1, 0), (4, 3) and (1, 2)


To find: coordinates of point where diagonals meet.


Formula Used:


section formula:


If point P (x, y) divides the line segment A (x1, y1) and B(x2,y2)


Then the coordinates of P are:



Explanation:


Let our points of parallelogram be A( - 2, - 1), B(1, 0), C(4, 3) and D(1, 2) and midpoint of diagonals be E(x,y)



We know that diagonals of a parallelogram bisect each other.


Hence, we find the midpoint of AC.


As mid - point divides a line into 1:1.


By section formula,



For point E (x, y)




E (x, y) = (1 , 1 )


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