Annular Sector
The area of an annular sector, arc lengths and perimeter from two radii and an angle, with a figure.
Use any units for the radii, and the area comes out in those units squared.
This calculator finds the area of an annular sector, the arc lengths and the perimeter from two radii and the central angle.
S = α/360° · π(R² − r²)
Example. R = 10, r = 6, α = 90°: S = ¼ · π · (100 − 36) = 16π ≈ 50.27.
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