Homework Help: math

Posted by syram on Thursday, March 7, 2013 at 6:11pm.

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 - PsyDAG, Friday, March 8, 2013 at 1:24pm
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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