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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It can mean lots of different things in different contexts. Some of these are
what does key mean in math
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A lower case "r."
figure math means figure math
the mean (in math) is the average of all the numbers in the problem