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GeomBench
What fraction of the full circle's pie are you slicing?
A sector is the fraction (angle ÷ 360°) of a full circle. Multiply that fraction by the full circle's area (πr²) for sector area, or by its circumference (2πr) for arc length.
Pizza-slice portions, pie charts, sprinkler coverage patterns, and gear-tooth design all rely on sector area and arc length calculations.
Sector area
28.274
What you entered
Fraction of the full circle
90 ÷ 360= 0.25Sector area
0.25 × π × 6²= 28.2743Arc length
0.25 × 2π × 6= 9.4248Result
Sector area: 28.274
A 90° slice of a circle with radius 6 has an area of 28.274 and an arc length of 9.425.