Area of a circle = pi*radius squared
Circumference of a circle = 2*pi*radius or diameter*pi
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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.
The formula for the circumference of a circle is pi * diameter or (2 radius.)