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[[1]] is the surface area of a sphere of radius: 10.5 cm.

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Detailed Solution

The content of a circle with radius is

. We can say that the surface area of a sphere is 4 times the area of a 2-dimensional circle with the same radius.
Let us substitute 10.5 cm for

r

in the formula.

S . A = 4 π (10.5) 2

S . A = 4 × 227 × 10510 × 10510 ⇒ S . A = 1386

The surface area of a sphere with radius 10.5 cm is 1386

{cm}^{2}

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