Q.
If (2,1),(−1,−2),(3,3) are ,midpoints of sides BC,CA,AB of ΔABC , then the equation of AB is
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a
x−y=1/2
b
x+y=1
c
x−y=9
d
x=y
answer is D.
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Detailed Solution
Let D=2,1 ,E-1,-2, F3,3 are mid points of sides BC,CA,AB respectively therefore DE is parallel to side AB, so AB slope= DE slope= 1, ⇒ AB equation is y-1=1x-1⇒y=x
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