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March 26, 2017

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A circular coaster, with a diameter of 7 inches, is positioned on a white placement. The placement is a circle whose radius is equal to the diameter of the coaster. About how many square inches of the placemat are NOT covered by the coaster? Show your work.

  • math - ,

    It would help if you proofread your questions before you posted them.

    I assume that all of your "placements" are really placemats.

    Area = π * r^2

    d = 2r

    Area of coaster = π * 3.5^2

    Area of placemat = π * 7^2

    Subtract area of coaster from area of placemat.

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