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A circular plate with a diameter of 20 inches is placed on a

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A circular plate with a diameter of 20 inches is placed on a [#permalink] New post 23 Apr 2018, 06:17
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A circular plate with a diameter of 20 inches is placed on a circular placemat with a diameter of 24 inches. What fraction of the placemat's surface area is not covered?

A. \(\frac{11}{144}\)

B. \(\frac{11}{36}\)

C. \(\frac{25}{36}\)

D. \(\frac{20}{24}\)

E. \(\frac{41}{44}\)
[Reveal] Spoiler: OA

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Re: A circular plate with a diameter of 20 inches is placed on a [#permalink] New post 23 Apr 2018, 12:28
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calculate area of circular plate and of placemat (remember to convert diameter to radius).
Subtract area of circular plate from placemat.
Divide the above answer by area of of placemat.

(In order to save time, leave pi as it is and cancel it out in the last step)
Re: A circular plate with a diameter of 20 inches is placed on a   [#permalink] 23 Apr 2018, 12:28
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A circular plate with a diameter of 20 inches is placed on a

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