Question

The diameter of a cylindrical roller is 9.1 cm, and it is 2.8 m long. Find the area it will cover in 30 revolution ​

Answer 1

Answer:

240240cm² or 24.0240m²

Step-by-step explanation:

radius of cylinder = 4.55 cm

length of cylinder = 280 cm

curved surface area of a cylinder =

$2\pi \: rl$

put the values

2 × (22÷7) × 4.55 × 280 = 8008

curved surface area = 8008cm²

now this roller revolves 30 times on the ground

so the total area which will be covered by it =

curved surface area × 30

8008 × 30 = 240240

hence 240240cm² or 24.0240m² area will be covered.

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Answer 2

Answer:

given diameter of cylindrical roller is 9.1 cm and is 2.8 m long

to find = the area it will cover 30 revolution

solutions

diameter of cylindrical roller = 9:1

the radius of a cylindrical roller = 4.55 cm

the height of cylinder is 2.8m long

the area of a roller = curved surface of cylinder

hA=2πrh

A / 2×722×4.55×2.8

A=80 .08 sq

So area of one revolution is 80.08 cm sq

Area of 30 revolution 80.08cm sq

Area of 30 revolution 2408.4 cm sq

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