Omar studies the effects of a drought on the depth of water in a pond. He takes a reading of the water depth at the same location in the pond every day for the duration of the drought. Which method of displaying data would he most
likely use to show changes in a water depth?
Oa bar graph
Oa line graph
Oa data table
O a pie graph

V = (4/3) × pi × r^3
A = 4 × pi × r^2

These formulas share "r" in common, so a good idea would be to solve for r using the formula for V since we are given the volume.

576 = (4/3)×pi×r^3
576 × (3/4) = pi×r^3
576 × (3/4) / pi = r^3
(576 × 3/4 / pi)^(1/3) = r
(notice that (r^3)^(1/3) = r)
432 / pi = r

Since r^2 is in the surface area formula, let's solve for that.
r = 432 / pi
r^2 = (432/pi)^2
= 432^2 / pi^2
= 186624 / pi^2

A = 4 × pi × r^2
= 4 × pi × (186624 / pi^2)
= 4 × 186624 × (pi / pi^2)
= 4 × 186624 × (1 / pi)
= 4 × 186624 / pi
= 237617.0568 in^2