posted by LP on .
A Target consists of three concentric circles with the same center.
The radii of the circles have lengths of 3 inches, 7 inches and 9 inches.
The 7 inch radii spacing is shaded.
(To the nearest percent,)
What percent of the target is shaded?
assuming you meant that the region between the 3" circle and the 7" circle is shaded,
(7^2-3^2)/9^2 = (49-9)/81 = 40/81 = 49%