Hi,
My first thought (without thinking about it much) is that since one's hand is pretty much uniformly thick, why not measure the volume (for example place the hand in a rectangular pan with enough water to cover the hand, and measure the amount of water displaced), then divide by the thickness?
A completely different approach, photocopy the hand and use areafinding computer software (or graph paper, or other approximation technique).
Chris
You could trace your hand on a piece of grid paper (1 cm), count the complete squares and approximate the partially completed squares. That will only give you an approximation.
Diane
