140 feet.
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Circumference (the number I assume you want) = Pi X D C = 3.14 x 30 C = 94.2 There are 94.2 linear feet in a 30 foot diameter circle.
The floor is 30 square feet.So is the ceiling.
Feet and linear feet are the same measurement. Therefore, 30 feet is equal to 30 feet.
Multiply the 30 by 30.48 (cm per linear foot) and you get 914.4 cm. 914.4 squared is 836127.36 cm2. Divide that by 10,000 (cm2 per m2) and your answer is 83.612736 m2.
There is no answer. Square feet are a measure of area. Linear feet are a measure of distance. They are totally different things. You can only convert between measures of the same thing, e.g. 1 square foot = 144 square inches and both are measures of area.