To approximate is to find a number close to a real number.^{[1]} Since irrational numbers can not be exactly stated as a decimal, an approximation is used. For example, the value of π is approximately 3.14159. The symbol for writing 'approximately equal to' is '≈'. For example, π ≈ 3.14159.
One method of approximation is called interpolation. The study of approximation in mathematics is called approximation theory which is a branch of numerical analysis.
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