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Question

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

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