Question

the diameter of a roller is 112m. and its length is 150cm calculate its volume​

Answer 1

Given: Diameter=112cm

Radius= 112÷2

= 56cm

height= 150cm

CSA of roller:

\begin{gathered}2\pi {r} h \\ = 2 \times \frac{22}{7} \times {56} \times 150 \\ = 2\timles 22 \times 8 \times 150 \\ = 52,800 cm^{2}\end{gathered}2πrh=2×722×56×150=2×22×8×150=52,800cm2

Area levelled:

\begin{gathered}500 \times csa \\ = 500 \times 52800 {cm}^{2} \\ = 26400000 {cm}^{2} \\ ( {1m}^{2} = 10000 {cm}^{2} ) \\ = 2640 {m}^{2}\end{gathered}500×csa=500×52800cm2=26400000cm2(1m2=10000cm2)=2640m2

The roller levelled 2,640m².