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Error propagation in numerical analysis is just calculating the uncertainty or error of an approximation against the actual value it is trying to approximate. This error is usually shown as either an absolute error, which shows how far away the approximation is as a number value, or as a relative error, which shows how far away the approximation is as a percentage value.
Accuracy
Quite simply, somebody noted that 22/7 is a fairly close approximation of the value of pi.
This is termed the accuracy of the measurement.
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