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Step-by-step explanation:
curved surface area of a cylinder = 2πrh
& base of cylinder = πr²
4(2πrh) = 6(πr² + πr²) [given]
8πrh = 6(2πr²)
96πr = 12πr² [h = 12cm]
96 = 12r
r = 96/12
r = 8
Curved surface area = 2πrh
= 2 × 22/7 × 8 × 12
= 44/7 × 96
= 4224/7
= 603.43 cm²
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