Calculating Diameter to Square Feet

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<h3>Calculating Diameter to Square Feet</h3>

The diameter quantifies the distance of a straight line from one point on a circle through the center to another point opposite it, and can be measured in feet. The area of a circle can be measured in square feet. Figuring the area can be useful if you need to calculate how much paint to buy or how much sod would to cover a lawn.

1. Find Your Formula

Consider the formula for the area of a circle:



(A = πr^2)

The radius of a circle, the distance from the center to a point on the circumference, is one half of the diameter.

2. Find the Radius

Divide the diameter, measured in feet, by two to find the radius of the circle. For example, if the circle’s diameter equals 4.5 feet, divide 4.5 by 2 to get 2.25 feet for the radius.

3. Square the Radius

Multiply the radius by the radius. Here, multiply 2.25 feet by 2.25 feet to get 5.0625 square feet.



4. Multiply by Pi

Multiply the value for the radius squared by pi, commonly approximated at 3.14159, to find the area of the circle in square feet. Finishing the example, multiply 5.0625 by 3.14159 to find the area of the circle, about 15.904 square feet.

Dave Pennells

By Dave Pennells

Dave Pennells, MS, has contributed his expertise as a career consultant and training specialist across various fields for over 15 years. At City University of Seattle, he offers personal career counseling and conducts workshops focused on practical job search techniques, resume creation, and interview skills. With a Master of Science in Counseling, Pennells specializes in career consulting, conducting career assessments, guiding career transitions, and providing outplacement services. Her professional experience spans multiple sectors, including banking, retail, airlines, non-profit organizations, and the aerospace industry. Additionally, since 2001, he has been actively involved with the Career Development Association of Australia.