A solid cylinder is cut vertically as shown in the image. Its diameter – InterviewSolution

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1.	A solid cylinder is cut vertically as shown in the image. Its diameter and height are 12 cm and 15 cm, respectively. If the diameter is divided in the ratio 3:1, what is the increase in its surface area (in cm2)?
Answer» A solid cylinder is cut vertically as shown in the image. Its diameter and height are $12 c m$ and $15 c m$ , respectively. If the diameter is divided in the ratio $3 : 1$ , what is the increase in its surface area (in $c m^{2}$ )?

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