How Much Ice Does Antarctica Really Hold?

[elpermic]

Homework Statement

Antartica is roughly semicircular, with a radius of 2000km. The average thickness of its ice cover is 300m. How many cubic centimeters of ice does Antartica contain? Assume we ignore the curvature of Earth.

Homework Equations

(4/3 Pi r^3h)/2

The Attempt at a Solution

I plugged r=2.0x10^8 and 3.0x10^5 and wound up with the answer 5.0 x 10^30

I just want to check if this is right. I just started my Physics course a couple days ago.

 

[rl.bhat]

The relevant equation is wrong.
Area of the circle is π*R^2
Area of the semicircle is ...?