Find the total surface area of a cylinder whose radius is 21 cm and height is 9 cm? (Use π = 22/7)
1. 4096 cm2
2. 2048 cm2
3. 3960 cm2
4. 4060 cm2
1. 4096 cm2
2. 2048 cm2
3. 3960 cm2
4. 4060 cm2
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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