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Pi is the ratio of a circle's circumference to its diamter. It equals approximately 3.14159 Pi = circumference/diameter
Ends over one
3:17
I presume you don't mean 21 minus 13; that is easy enough, and equals 8. If you mean the ratio 13/21, all you do is divide. The answer is 0.1690___.
A ratio with denominator 0 is not defined.