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There is actually a set measurement for a "hand". The length of a hand is 9 inches and is called a "span". the width of a hand is 4 inches.
Area = Length*Width so Width = Area/Length. Therefore the Width can be calculated. Then, perimeter = 2*(Length + Width) and everything on the right hand side of the equation is known so the perimeter can be calculated.
A crayon is about 1 decimeter long =)
One hand is 4 inches, more or less. A hand is an old measure- the width of a hand - used mostly, I think, for measuring the height of horses. One could move up horse hand by hand and count how many hands tall the horse is.