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Usually, in terms of school work, an exact answer leaves pi in the answer. Since pi is an irrational number, as soon as you try to substitute a value for it in your calculations, you are introducing an approximation.

So, for a circle with radius 5 cm,

a circumference given as 10*pi cm is an exact answer but 31.4159 cm is an approximation.

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Q: What is the difference between an exact answer and an approximated answer when dealing with circles?
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