Question

4) A paint roller has a diameter of 10cm and height of 21 cm. How much area can the paint roller cover eight revolution?

Answer 1

Answer:

Lateral surface area of paint roller=2πrh

=2*22/7*5*21=660cm^2

area in 8 revolution=660cm^2*8=5280cm^2

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Answer 2

Answer:

• 5280 cm² can the paint roller cover eight revolution.

Step-by-step explanation:

Given:

• Diameter of paint roller = 10cm
• Height of paint roller = 21cm

To Find:

• Area can the paint roller cover in eight revolution.

Solution:

• Diameter = 10 cm
• Radius = 10/2 = 5 cm

Using formula:

• CSA of Cylinder = 2πrh

⟶ Curved surface area = 2 × 22/7 × 5 × 21

⟶ Curved surface area = 2 × 22 × 5 × 3

⟶ Curved surface area = 44 × 5 × 3

⟶ Curved surface area = 660 cm²

Now,

⟶ Area = curved surface area × 8

⟶ Area = 660 × 8

⟶ Area = 5280 cm²

∴, 5280 cm² can the paint roller cover in eight revolution.