Question

the diameter of a spherical ball is 21cm how much leather is required to prepare 5 such ball

Answer 1

$\mathtt{hi}$

sphere has diameter 21cm
so, radius = 21/2 => 10.5

we need to know the quantity of leather.
so, let us find volume of one sphere.➡️➡️➡️

▪$volume of sphere = \frac{4}{3} \pi {r}^{3}$

▪$\frac{4}{3} \times \frac{22}{7} \times {10.5}^{3}$

▪$volume \: = 4849.05$

$\mathtt{leather \: needed \: for \: 5 \: such \: balls = 5 \times volume}$

▪$5 \times 4849.05$

▪$24,245.25 \: {cm}^{3}$


$\mathtt{hope \: it \: helps}$