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Formulas for Circumference and Area of a Circle, with Examples

These videos use π and the approximation 3.14 for π in computing the circumference and area of a circle. Students must already know how to work with decimals.
π is an irrational number, which means it CANNOT be written as a terminating decimal (like 3.14) or a fraction (like 22/7).  Both 3.14 and 22/7 are only approximations.