Circles are most simply and commonly specified by their diameter.
So a 30 foot circle has a diameter of 30 feet.
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The Old Testament in 1 Kings 7:22 and 2Chronicles 4:2 implies that it is diameter 10, so it must be true!
188.4955592 feet
How many sq. Ft. Is in a 33 ft.diameter circle
The circumference of a circle with a 30 ft radius is approx 188.5 feet.
Circ = 2 pi r, Diam = 2r so circumference = pi times diameter