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Math and arithmetic? This question should be in the health section. Anyway, non-antalgic gait with reciprocal arm swing means you're walking normally with both arms swinging freely, yet subtly. A person with an antalgic gait walks gingerly--favoring the healthy side to protect and/or prevent additional pain on the affected (injured) side and typically abbreviating the duration of the foot plant on the injured side.
An arm's length is a distance approximately equal to the length of a human arm, sometimes used figuratively.
a lever with an effort arm of 2 inches
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.
Not if you are a normal human being. The distance from the fingertips of your outstretched arm to somewhere on the opposite collarbone is likely to be nearer a metre.