Napoleon had two arms, the hand in waistcoat stance was reflection of 'manly boldness tempered with modesty
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The average human body height to arm span ratio is approximately one to one. The arm to body ratio in a human is two to one.
The length of one arm is about 40% of your height
Roughly 1
Arm span or reach (also known as wingspan) is the physical measurement of the length from one end of an individual's arms (measured at the fingertips) to the other when raised parallel to the ground at shoulder height at a one-hundred eighty degree angle. The average reach correlates to the person's height. So, it is impossible to say how many centimeters is YOUR arm span or MY arm span without measuring it first. For example, my arm span is 183cm.
An adult's arm length.