9. How many spheres each of radius 1cm will have their total surface area equal to that of a single sphere of radius
5cm?
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Answer:
volume of sphere of radius 10cm=
3
4
π×10
3
volume of sphere of radius 1cm=
3
4
π×1
3
no of balls =
volume of sphere of radius 1 cm
volume of sphere of radius 10 cm
=
3
4
π×1
3
3
4
π×10
3
=1000
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