write each radius from the problem situation as a power.
radius of 8-inch drumhead: r =
radius of 18-inch drumhead: r =
radius of 16-inch drumhead: r =
4
9
8
THE radius is half of the diameter
radius of 8-inch drumhead: r =
radius of 18-inch drumhead: r =
radius of 16-inch drumhead: r =
9
8
THE radius is half of the diameter