# Volume of a hollow sphere is 11352/7 cm³. If the outer diameter is 16 cm , find the inner radius and outer surface area of the sphere .

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=4/3×22/7×(8^3-r^3)=11352/7

=88/21×(512-r^3)=11352/7

=512-r^3=11352/7×21/88

=512-r^3=387

=-r^3=387-512=-125

so,r^3=125

therefore r=5.

Now, outer surface area=4×pi×r^2

=4×22/7×8^2

=(88/7×64)cm^2

=5632/7 cm^2