Q.
Let C be the circle with centre (0,0) and radius 3 units. The equation of the locus of the mid points of the chords of the circle C that subtend an angle of 2π3 at its center is
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a
x2+y2=32
b
x2+y2=1
c
x2+y2=274
d
x2+y2=94
answer is D.
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Detailed Solution
Let M(h,k) be the mid-point of chord AB where ∠ACB=2π3∴∠ACM=π3 Also CM=3cosπ3=32⇒h2+k2=32⇒h2+k2=94∴ Locus of (h,k) is x2+y2=94
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