The curved surface area and the height of a right circular cylinder are 660 cm2 and 10 cm respectively. Find its diameter (in cm).
Answer & explanation
Correct answer: option 3
The curved surface area of right circular cylinder = 2\(\pi \)rh
2\(\pi \)r × 10 = 660
r = \(\frac{660 × 7}{2 × 10 × 22}\)
r = 10.5cm
Diameter = 2r = 2 × 10.5 = 21 cm