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Question

In the formula, area of circle =πr2, the numerical constant of the expression πr2 is ________.


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Solution

Determine the numeric constant in the formula of the area of a circle.

According to the definition of a constant, a constant is a quantity that has a fixed value.

In the formula of the area of a circle, there are two quantities first one is radius r and the second one is π.

As we know, radius varies from circle to circle but the value of π is fixed that is 3.141.

Therefore, the numerical constant of the expression πr2 is π.


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