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It depends on context. R can stand for radius, which is a straight line from the center to the circumference of a circle or sphere. In the the equation d = rt, r stands for rate,

the speed with which something moves, happens, or changes. R can also stand for degrees Rankine, which are not widely used today.

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7y ago
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7y ago

It can mean lots of different things in different contexts. Some of these are

  • correlation coefficient
  • side of a polygon
  • radius
  • reaction force (mechanics)
  • a variable counter (as in nCr or nPr in combinations and permutations).

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Q: What does r mean in math?
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