Question

How to finds the surface area and volume of a cube

Answer 1

The sphere has only one dimension

It is its radius

Then the rule of its volume is

`V=(4)/(3)\pi r^3`

The rule of its surface area is

`A=4\pi r^2`

Let the radius of the sphere is 21 cm

r = 21 cm

Substitute it in the rule of the volume to find it

Use pi = 22/7

`\begin{gathered} V=(4)/(3)*(22)/(7)*(21)^3 \\ \\ V=38808\text{ cm}^3 \end{gathered}`

Substitute r by 21 in the rule of the area to find it

`\begin{gathered} A=4*(22)/(7)*(21)^2 \\ A=5544\text{ cm}^2 \end{gathered}`

The volume of the sphere which has a radius of 21 cm is 38808 cubic cm

The surface area of the sphere with same radius is 5544 square cm