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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