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 revolutions.​

Answer 1

Step-by-step explanation:

9.1

2.8. = 119 × 30=3570 is a answer

Answer 2

Answer ⤵️

To find out what the area it will cover in 30 revolutions.So let's found out the C.S.A of the cylinder.

Diameter of the cylinder= 9.1 cm

Radius of the cylinder= 9.1/2= 4.55 cm

C.S.A= 2πrh

$2 \times \frac{22}{7} \times \frac{455}{100} \times 2.8 \\ = 2 \times 22\times \frac{65}{100} \times 2.8 \\ = 2 \times 22 \times \frac{13}{20} \times 2.8 \\ = \frac{1601.6}{20} \\ = 80.08 \: \: \: \: {cm}^{2}$

So, 80.08×30= 2402.4

So in 30 revolutions the roller will cover 2402.4

Step-by-step explanation:

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