By what percentage does the area of a circle decrease if its radius is decreased by half?
Explanation
When the radius is halved, the new area becomes (1/2)^2 = 1/4 of the original area, meaning the area is reduced by 75%.
When the radius is halved, the new area becomes (1/2)^2 = 1/4 of the original area, meaning the area is reduced by 75%.