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

Given :-

• A paint roller has a diameter of 10cm and height of 21 cm.

To Find :-

• How much area can the paint roller cover in eight revolution?

Solution :-

• Curved surface area = 2πrh

Where,

• Diameter = 10 cm
• Radius = 10/2 = 5 cm
• Height = 21 cm

➟ CSA = 2 × 22/7 × 5 × 21

➟ CSA = 2 × 22 × 5 × 3

➟ CSA = 44 × 5 × 3

➟ CSA = 660 cm ²

Now,

➟ Area = 660 × 8

➟ Area = 5280 cm²

∴ 5280 cm² area can the paint roller cover in eight revolution

Answer 2

$\sf\orange{\underline{Question:-}}$

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

$\sf\green{\underline{Answer:-}}$

$\small \dag \sf \blue{ \underline{ \red{GIVEN}}}$

• Diameter = 10 cm
• Radius = 10/2 = 5 cm
• Height = 21 cm

$\small \dag \sf \blue{ \underline{ \blue{FORMULA}}}$

CSA of the cylinder = 2πrh

= 22/7 × 5 × 21

= 44 × 15

= 660 cm³

$\small\bigstar\mathtt{AREA\:COVERED\:IN\:8\:REVOLUTIONS\:}$

⟶ 660*8

⟶ 5280 cm³

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Hope it helps you ❤