area of large circle = π(49)
area of coaster = π(3.5^2) = 12.25π
The area not covered is the difference between the two areas.
A circular coaster, with a diameter of 7 inches, is positioned on a white placemat. The placemat 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.
1 answer