Simple Physics Question.... Help Please?

Suppose a Spaceman flies his spaceship into a Lake. The spaceship is 234 kg and, due to its air tight protective "forcefield" we can consider it to be a sphere (volume = (4/3)πR3). If the ship floats with only the small caution light visible (negligible m) above the surface in the lake. What is thecirference of the spaceship in cm? Remember that the cirference of a circle is 2πR.