Question

A water tank is cylindrical in shape and diameter of its base is 28m. If it is 7m deep, how many kilometres of water can it hold? ​

Answer 1

The answer is 4312 m^3

volume of cylinder = pie ×r×r×h

diameter = 28m

radius = 14m

height = 6m

volume = 22/7×14×14×7

=22×14×14

= 4312m^3

Answer 2

$\large\bf\underline\red{Question } \\ \\ \tt \: A \: water \: tank \: is \: cylindrical \: in \: \\ \tt \: shape \: and \: diameter \: of \: its \: \tt \: base \\ \tt \: is \: 28m \: . \: If \: it \: is \: 7m \: deep, \: \tt \: how \: \\ \tt many \: kilolitres \: of \: \tt \: water \\ \tt \: can \: it \: hold \: ? \\ \\ \\ \large\bf\underline\red{we \: have } \: \\ \\ \blue \star \: \sf \: diameter \: of \: the \: base = 28 \: m \\ \therefore \sf \: radius \: = \frac{ \cancel{28}}{ \cancel2} = 14m \\ \\ \blue \star \: \sf \: depth \: (height) \: of \: tank \: = 7m \\ \\ \\ \large\bf\underline\red{to \: find} \\ \\ ❝ \sf \: how \: many \: kilolitres \: of \: water \: can \\ \sf \: tank \: hold \: with \: radius \: 14m \: and \: \\ \sf \: height \: 7m \: ❞ \\ \\ \\ \large\bf\underline\red{formula \: used } \\ \fbox\blue{ volume \: of \: cylinder =πr²h } \\ \\ \\ \large\bf\underline\red{solution } \\ \\ \sf \: \pi {r}^{2} h \: = \frac{22}{7} \times 14 \times 14 \times 7 \\ \\ \: \sf \: \frac{22}{ \cancel7} \times 14 \times 14 \times \cancel 7 \\ \\ \sf \: 22 \times 14 \times 14 \\ \\ \fbox\blue{ 4312m³} \\ \\ \\ \bf \: as \: we \: know \: that \: : \\ \\ \sf \: 1kl \: = 1000l \\ \\ \sf \: 1 {m}^{3} = 1000l \\ \\ \sf \: 1 {m}^{3} = 1kl \\ \\ \bf\: so \: the \: tank \: hold \: kilolitres \: of \: \\ \bf \: water \: ➠ \: ➠ \large{\boxed{\mathbb\red{\fcolorbox{magenta}{aqua}{4312 \: kl}}}}$