Measuring the circumference, the length around the widest point, of a football is one-step in measuring the total surface area of the ball, or any other round or oblong object. The measurement can also be used to determine if a football has enough air in it. The measurement itself is very simple and only needs a few household items to complete.
Instructions
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1
Wrap the string around the center of the football.
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2
Hold your finger at the point where two points of the string come together.
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3
Keep your finger on that spot on the string and stretch it out on a flat surface.
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4
Lay the ruler next to it. The distance from the end of the string to your finger is the circumference.