Approximation

a mathematical calculation 1s not absolutely correct, but sufficiently near certain Practical purposes. Thus the circumof a circle of unit diameter is approximately the exact number cannot be expre ed with a number of figures, and the importance of a approximation is obvious. ‘Too high a of accuracy is needle in practical calculaand involves waste of labour. Hence the utility of abridged methods of multi plica and division, of logarithmic and trigonometrical which all involve approximations.