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# Monday's Ask the Experts: Measuring circular areas

February 1, 2010

Monday''s Ask the Experts question from a cleaning professional on the International Custodial Advisors Network (ICAN) "Ask the Experts" page: I’ve been cleaning office buildings for years, but now I’m looking to start my own cleaning business. My question is, How do you determine the square footage of areas that are not squared, but oval or circular?

The answer:

And we thought that learning all that high school geometry was a waste of time.

The area of a circle is found by multiplying the radius of the circle by itself and the result by Pi, 3.1416. A=(Pi)r² Remember, the radius is one-half the diameter.

The area of an oval (ellipse) is calculated by the formula, A=(Pi)ab, where a is one- half the major axis and b is one-half the minor axis. Multiply the product of these two by 3.1416 (Pi) and you will have your answer.

For a graphic explanation ... — Lynn E. Krafft, ICAN/ATEX Editor

lekrafft@juno.com

The area of a circle is found by multiplying the radius of the circle by itself and the result by Pi, 3.1416. A=(Pi)r² Remember, the radius is one-half the diameter.

The area of an oval (ellipse) is calculated by the formula, A=(Pi)ab, where a is one- half the major axis and b is one-half the minor axis. Multiply the product of these two by 3.1416 (Pi) and you will have your answer.

For a graphic explanation ... — Lynn E. Krafft, ICAN/ATEX Editor

lekrafft@juno.com

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