math
posted by bibiana .
half the distance across a circular garden measures 4.9 meters. Estimate how many meters of fencing material will be needed to enclose the garden.

the diameter is appr. 10 m
circumference of a circle = pi(d)
= appr. 3x10 = 30
I rounded up on the diameter but rounded down for pi, so ... should be close.
(actual answer = 30.79)