The volume of the cylinder is 12320 cm3 and the height of the cylinder

1.	The volume of the cylinder is 12320 cm3 and the height of the cylinder is 20 cm then find the cost of painting the total surface area of the cylinder at the rate of 4 per cm21. 119682. 129683. 124564. 11768
Answer» Correct Answer - Option 1 : 11968 Given: Volume of the cylinder = 12320 cm3 Height of the cylinder = 20 cm Formula used: Total surface area of the cylinder = 2 π r(r + h) Volume of the cylinder = π r2 h Here, h and r is the height and radius respectively Calculation: Volume of the cylinder = π r2 h ⇒ 22/7 × r2 × 20 = 12320 ⇒ r2 = 196 ⇒ r = 14 cm Now, Total surface area of the cylinder = 2 π r(r + h) ⇒ 2 × 22/7 × 14(14 + 20) ⇒ 2992 cm2 Cost of painting = 4 × 2992 = 11968 ∴ The cost of painting is Rs 11968

The volume of the cylinder is 12320 cm3 and the height of the cylinder is 20 cm then find the cost of painting the total surface area of the cylinder at the rate of 4 per cm21. 119682. 129683. 124564. 11768

Answer» Correct Answer - Option 1 : 11968

Given:

Volume of the cylinder = 12320 cm3

Height of the cylinder = 20 cm

Formula used:

Total surface area of the cylinder = 2 π r(r + h)

Volume of the cylinder = π r2 h

Here, h and r is the height and radius respectively

Calculation:

Volume of the cylinder = π r2 h

⇒ 22/7 × r2 × 20 = 12320

⇒ r2 = 196

⇒ r = 14 cm

Now, Total surface area of the cylinder = 2 π r(r + h)

⇒ 2 × 22/7 × 14(14 + 20)

⇒ 2992 cm2

Cost of painting = 4 × 2992 = 11968

∴ The cost of painting is Rs 11968

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