Antarctica is roughly semicircular, with a radius of 2000 km (Fig. 1-5). The average thickness of its ice cover is 3000 m. How many cubic centimeters of ice does Antarctica contain? (Ignore the curvature of Earth.)

And... what did you try?

12000000000 km/m2

How did you come to that number?

Plus that's not the correct unit.

Base time height

Okay, what base did you take? And how did you get the value of the base?