Question

The centres of a set of circles, each of radius 3, lie on the circle x²+y²=25. The locus of any point in the set is
(a) 4 ≤ x²+y² ≤ 64
(b) x²+y² ≤ 25
(c) x²+y² ≥ 25
(d) 3 ≤ x²+y² ≤ 9

Answer 1

each of radius 3, lie on the circle x²+y²=25. The locus of any point in the set is

(d) 3 ≤ x²+y² ≤ 9