[Angle] x ∏ x R2
360°
The first part of the formula reads "angle divided by 360 degrees" sorry if this was unclear.
R2 = Radius squared (R x R).
∏ = pi (3.1415926535...)
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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.
No because the formula for finding the area of an oval, which is an ellipse, is quite different
The area of a sector is the area of the circle multiplied by the fraction of the circle covered by that sector. This is a true statement and correct formula.
The answer depends on the formula for what: the radius, circumference, length of an arc, area, area of sector, area of segment: each one has a different formula.
Squares are rectangles so the formula for area will stay the same.