Quantitative Aptitude :: Volume and Surface Area - Discussion

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Explanation:
Slant Height, l = ?(r^2 + h^2) =?(21^2 + 28^2) = ?1225 = 35 cm
Volume = 1/3?r^2h = (1/3 * 22/7 * 21 * 21 * 28) cm^3 = 12936 cm^3
Curved surface area = ?rl = 22/7 * 21 *35 cm^3 = 2310 cm^2
So,total Surface Area = (?rl + ?r^2) = (2310 + 22/7 * 21 * 21) cm^2 = 3696 cm^2