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With A(0, 0) and B(3, 0), P moves so that PA = 2PB. The locus is a circle of radius
A3 units
B2 units
C4 units
D1 unit
Answer & Solution
Correct answer: B. 2 units
PA^2 = 4PB^2 gives x^2+y^2-8x+12 = 0, i.e. (x-4)^2 + y^2 = 4, so the radius is 2.
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