# If (2,1) (-1,-2) (3,3) are the midpoints of sides bc,ca ,ab of traingle abc then the equation of ab is

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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