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Subjects
Mathematics CBSE
Class 9
Surface Areas and Volumes
Textbook Questions
12.
Exercise Problems IX
Exercise condition:
3
m.
Twenty-seven solid iron spheres, each of radius
r
and surface area
S
are melted to form a sphere with surface area
S’
. Find the
(i)
radius
r’
of the new sphere
=
(ii)
ratio of
S
and
S’
=
:
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