The diameter of a right circular cylinder is 14 cm and height is 2 cm. The sum of its curved surface area and the total surface area is: (use π = 22/7)
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 484 cm2
Given that,
The diameter of a right circular cylinder is 14 cm and the height is 2 cm
The curved surface area of a cylinder = 2πrh
The total surface area of a cylinder = 2πrh + 2πr2 = 2πr(r + h)
Hence, the sum of its curved surface area and the total surface area is = 2πrh + 2πr(r + h)
= 2 × 22/7 × 7 × 2 + 2 × 22/7 × 7 × (7 + 2)
= 88 + 44 × 9 = 88 + 396 = 484 cm2