Question

Find the volume and surface area of a sphere of radius $2.8$ cm. (Use $\pi =\frac{22}{7}$).

Answer 1

Given that, the radius of a sphere is $2.8cm$

To find out: The volume and surface area of the sphere.

We know that, volume of a sphere $=\frac{4}{3}\pi r^3$

$=\frac{4}{3}\times \frac{22}{7}\times (2.8{)}^3[\because \pi =\frac{22}{7}]$

$=\frac{1931.78}{21}$

$=91.99c{m}^3$

We also know that, surface area of a sphere $=4\pi r^2$

$=4\times \frac{22}{7}\times (2.8{)}^2[\because \pi =\frac{22}{7}]$

$=\frac{689.92}{7}$

$=98.56c{m}^2$

Hence, the volume of the given sphere is $91.99c{m}^3$ and its surface area is $98.56c{m}^2$.