A reasonable estimate of the moment of inertia of an ice skater spinning with her arms at her sides can be made by modeling most
of her body as a uniform cylinder. Suppose the skater has a mass of 64 kg . One eighth of that mass is in her arms, which are 60 cm long and 20 cm from the vertical axis about which she rotates. The rest of her mass is approximately in the form of a 20-cm-radius cylinder.
One inch of board is left if you subtract the two 3 inches pieces from the board the further subtract the 24 inches from the three 8 inches pieces you get 31-30