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.
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The speed ratio of a bicycle is the (gear ratio* radius of the wheel)/ Length of the pedal arm.
The only anime charecter I know that has one leg is Edward Elric from Fullmetal Alchemist. He loses it when he trys to do human transmutation and his brother Alphonse loses his entire body. but Edward gives his arm to bring Alphonses soul back, then he seals Als soul into a body of armor. But he gets metal limbs in place of his arm and leg. they function perfectly.
Yes, it is generally true that a person's arm span is roughly equal to their height. This relationship is known as the "Arm Span to Height Ratio" and is often used in various fields, including medicine and sports. However, individual variations exist, and some people may have a longer or shorter arm span compared to their height.
around 1 FOOT
When measuring body lengths for example your shoulder to arm verse your elbow to finger tip