Centre of mass- a point where all of an objects mass appears to be concentrated.
To find the centre of mass:
Suspend the shape so it can swing freely.
Find the vertical using a plumb line and draw this vertical on.
Hang the shape from another point and find the vertical again.
Where the two lines cross is the centre of mass.
When a shape has more than one line of symmetry, the centre of mass is where they cross.
When a shape has only one line of symmetry, the centre of mass is somewhere on that line.
Centre of mass doesn't have to be inside the object. For example, in a ring it is in the centre.
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