Q : 1    Find the surface area of a sphere of radius:

            (i)  \small 10.5\hspace{1mm}cm

Answers (1)

We know,

The surface area of a sphere of radius r = 4\pi r^2

\therefore Required surface area = 4\times\frac{22}{7} \times(10.5)^2

\\ =88\times1.5\times10.5 \\ = 1386\ cm^2

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