If a solid sphere of radius r is melted and cast into the
shape of a solid cone of height r, then the radius of the
base of the cone is–
(a) 2r (b) 3r (c) r (d) 4r

• volume of sphere=volume ofcone
  4/3pi*r^3=1/3*pi*R^2*h , where R is radius of cone and H=r
  4*r^2=R^2,
  R=2*r;
  A is ans
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