pi x radius squared.
3.141596 x r2
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V = (pi) (radius)2 (length)
The formula is:Volume of a circle = 0
Area formula for circle= --,,- r 2
Yes the great circle formula is the same formula for any other circle.
There is no specific formula for a sector of a circle. There is a formula for its angle (at the centre), its perimeter, its area.