If the radius and height of a right circular cylinder are 21 cm and 5 cm, respectively, then the total surface area of cylinder is (use ):
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e 3432 cm2.
The total surface area of a cylinder = 2πr(r + h)
Where r is the radius, h is the height.
Radius of the cylinder (r) = 21 cm
Height of the cylinder (h) = 5 cm
Total surface area = 2 × (22/7) × 21(21 + 5) = 2 × (22/7) × 21 × 26 = 3432 cm2
Therefore, the total surface area of the cylinder is 3432 cm2.