Arm span is approximately equal to a person's height. So the predicted height of a person with an arm span of 66in is also 66in.
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For the average person, the arm span is going to match the height. However, it can vary by several inches in either direction.
a lever with an effort arm of 2 inches
25 inches.
about 2-3 inches.
Most adults have different sizes of arms therefor you wil have to be more specific