The sum of the radius of the base and the height of a closed solid cylinder is 12.5 cm. If the total surface area of the cylinder is 275 cm², then its radius is: (Take π = 22/7)
3.5 cm
Total surface area of a closed cylinder = 2πr(r+h). Given r+h = 12.5 cm and TSA = 275 cm²: 2×(22/7)×r×12.5 = 275, so r = (275×7)/(2×22×12.5) = 3.5 cm, matching option (C), which is also the option marked in the answer sheet.
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