Mary is wrapping a can of paint to gift it to a friend. If the can is 11 inches high and has a diameter of 7 inches then how many square inches of wrapping paper will be used? (take π = 3.14)
A
319 square inches
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B
241 square inches
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C
391 square inches
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D
421 square inches
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Solution
The correct option is A 319 square inches Given, diameter (d) = 7 inches So, radius (r) = 3.5 inches height (h) = 11 inches The total surface area is given by 2πr2+2πrh Hence, total surface area = 2 × 3.14 × 3.5 × 3.5 + 2 × 3.14 × 3.5 × 11 ⇒ Surface Area = (77 + 242 ) square inches = 319 square inches