The formula for finding the area of a circle is 𝑨 = π𝒓² The ability to round a number to a number of decimal places or to a number of significant figures is essential if answers are to be written to ...

The ability to round a number to a number of decimal places or to a number of significant figures is essential if answers are to be written to the correct degree of accuracy asked for in a question.

A familiar relationship—the derivative of the area of a circle equals its circumference—is extended to other shapes and solids. Journal Information The Mathematics Teacher (MT), an official journal of ...