64. A(2) = 47, so the area enclosed by a circle with radius 2 meters is 47 square meters. The solutions to A(r) = 167 are r = 14. Since r is restricted to r > 0, we only keep r = 4. This means for the area enclosed by the circle to be 16% square meters, the radius needs to be 4 meters. Since r represents a radius (length), r > 0