# <span lang="EN-US

Thickness of sphere, t = 0.01m = 1 cm

Diameter of sphere = 12 cm

Outer Radius of sphere, RO = 6 cm

Inner Radius of sphere, RI = RO – t = 6 – 1 = 5 cm

Outer Surface area of sphere, A = 4πRO2

A = 4× 3.14 × 62

A = 452.16 sq.cm

V = 381.33 cm3

Mass = 8.88 × 381.33

Mass = 3385.94 gm

Outer surface area and mass of the sphere is 452.16 sq.cm and 3385.94 gm

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