Answers

2015-03-28T12:10:53+05:30
(x1+x2)    (y1+y2)    
______,_______ = (3,3)
       2          2
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2015-03-29T15:02:27+05:30
Let the coordinates of A be (x1,y1) B be (x2,y2) C be (x3,y3)
MIDPOINT OF AB=(3,3)⇒(X1+X2/2,Y1+Y2/2)=(3,3)
MIDPOINT OF BC=(2,1)⇒(X2+X3/2,Y2+Y3/2)=(2,1)
MIDPOINT OF CA=(-1,-2)⇒X1+X3/2,Y1+Y3/2)=(-1,-2)
X1+X2=6
X2+X3=4
X3+X1=-2⇒X1+X2+X3=8
Y1+Y2=6
Y2+Y3=2
Y3+Y1=-4⇒Y1+Y2+Y3=4
BUT WE WANT COORDINATES OF A AND B TO FIND EQUATION OF AB
X1=8-(X2+X3)=4
Y1=4-(Y2+Y3)=2
SIMILARLY YOU CAN GET B AND EQUATION OF AB
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