The spacing on ladder rungs should never be less than six inches or greater than 12 inches. The majority of 7 foot ladders have between 6 and 10 rungs.
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Assuming you mean "foot of the ladder": Sqrt(144 - 81) ie sqrt 63 = 7 feet 11¼ inches. If you mean what you wrote then zero distance!
7 foot circumference X 12 inches/foot = 84 inches in circumference
32
213.36 centimeters.
91 inches in 7 foot 7 inches.