The respective ratio of curved surface area and total surface area of a cylinder is 4 5 If the curve...........

Quantitative Aptitude ( CCS) Mensuration 3D

The respective ratio of curved surface area and total surface area of a cylinder is 4:5. If the curved surface area of the cylinder is 1232cm², What is the height?

14 cm

28 cm

7 cm

56 cm

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Explanation:

Answer & Explanation
Answer –28 cm
Explanation :
4x = curved surface area = 1232
x = 308
5x = total surface area = 1540
curved surface area = 2πrh
total surface area = 2πr(r + h)
2πr(r + h) = 1540
2πr² + 2πrh = 1540
2πr² = 1540 – 1232
r = 7; h = 28