Question

To plane a road ,a roller takes 800 rounds . The diameter of roller is 63 cm and length is 1 m , then find the area of road .

Answer 1

LSA of cylinder=curved surface of road=2pieRH
2×22/7×63/2×100
22×9×100
19800cm^2
19800×800
15640000cm^2
1564m sq

Answer 2

The area of road is 15840000  sq.cm.

Step-by-step explanation:

Diameter of roller = 63 cm

Radius of roller = $\frac{63}{2}=31.5 cm$

Length of roller = 1 m = 100 cm

Curved surface area of roller = $2 \pi r h = 2 \times \frac{22}{7} \times 31.5 \times 100=19800 cm^2$

Area covered in 1 round = 19800 sq.cm.

Area covered in 800 rounds = $800 \times 19800 =15840000 sq.cm.$

Hence The area of road is 15840000  sq.cm.

#Learn more:

To make a road plain a roller has to complete 750 rounds. If the diameter of roller is 84 cm and length 1 m, then find the area of road?

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