Find the total surface area of a cylinder whose radius is 21 cm and he

1.	Find the total surface area of a cylinder whose radius is 21 cm and height is 9 cm? (Use π = 22/7)1. 4096 cm22. 2048 cm23. 3960 cm24. 4060 cm2
Answer» Correct Answer - Option 3 : 3960 cm² Given: Radius of cylinder = 21 cm Height of cylinder = 9 cm Formula Used: Total surface area of cylinder = 2πr(h + r) Where, r = Radius and h = height of cylinder Calculation: Total surface area of cylinder = 2 × 22/7 × 21(9 + 21) cm² ⇒ 2 × 22/7 × 21(30) cm² ⇒ 2 × 22/7 × 630 cm² ⇒ 44 × 90 cm² ⇒ 3960 cm² ∴ The total surface area of the cylinder is 3960 cm²

Find the total surface area of a cylinder whose radius is 21 cm and height is 9 cm? (Use π = 22/7)1. 4096 cm22. 2048 cm23. 3960 cm24. 4060 cm2

Answer» Correct Answer - Option 3 : 3960 cm²

Given:

Radius of cylinder = 21 cm

Height of cylinder = 9 cm

Formula Used:

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

Where, r = Radius and h = height of cylinder

Calculation:

Total surface area of cylinder = 2 × 22/7 × 21(9 + 21) cm²

⇒ 2 × 22/7 × 21(30) cm²

⇒ 2 × 22/7 × 630 cm²

⇒ 44 × 90 cm²

⇒ 3960 cm²

∴ The total surface area of the cylinder is 3960 cm²

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Find the total surface area of a cylinder whose radius is 21 cm and height is 9 cm? (Use π = 22/7)1. 4096 cm22. 2048 cm23. 3960 cm24. 4060 cm2

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