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.
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When measuring body lengths for example your shoulder to arm verse your elbow to finger tip
What's on one side is the same as what's on the other, reflected. For example, average human has line of symmetry down the middle. Left eye matches right eye. Left arm matches right arm, and so on.