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Mid-point formula

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X(-3,-1),Y(-1,9)and Z(7,1)are the vertices of an traingle. M and N are mid-points of XY and XZ respectively.Find the coordinates of the mid point MN.

最佳解答:

X(-3,-1),Y(-1,9)and Z(7,1)are the vertices of an traingle. M and N are mid-points of XY and XZ respectively.Find the coordinates of the mid point MN. Sol set P is mid-points of YZ (-1+7)/2=3,(9+1)/2=5 then P(3,5) (3+(-3))/2=0,(5+(-1))/2=2 so the coordinates of the mid point MN is (0,2)

其他解答:

let coordinate of M be (a,b) a= [-3+(-1)] / 2 = -2 b= (-1+9) / 2 = 4 therefore coordinate of M is (-2,4) let coordinate of N be (c,d) c= (-3+7) / 2 = 2 d= (-1+1) / 2 = 0 therefore coordinate of N is (2,0) hence let coordinate of the mid-point of MN be (e,f) e= (-2+2) / 2 = 0 f= (4+0) / 2 = 2 therefore,the coordinate of the mid-point of MN is (0,2) 2009-05-02 19:49:31 補充: coordinates are writen as (x,y) add up the two x-coordinates given representively then divide by 2 to find the mid-point x-coordinate add up the two y-coordinates given representively then divide by 2 to find the mid-point y-coordinate
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