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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.
after you have downloaded the hypercam, At the top left hand you see a HYPERCAM. click it and you see a HyperCam2 appear. Look at " Screen Area ". You see the width and height there. Change it