Center of Gravity: Does It Have to be Inside Object?

[macmac410]

Homework Statement

1.) Does the center of gravity of an object have to be within geometric confines of the object? Please explain, coz I'm really confuse.

2.)where is the center of gravity of a doughnut? Explain

Homework Equations

i don't know the relevant equations

but i can answer it logically, but I'm not sure about my answer. Please help!

The Attempt at a Solution

 

[Delphi51]

The center of gravity is in the hole of the doughnut.