Calculate the area of a 'pizza slice' sector of a circle.
Sector Dimensions
°
Calculation Results
39.27
Sector Area (A)
The area of the portion of a circle enclosed by two radii and an arc.
Arc Length (s)7.85
Total Perimeter27.85
About this calculator
What is a Circular Sector?
A sector is a part of a circle bounded by two radii and an arc. The most common example of a sector is a slice of pie or pizza. The area of a sector depends exclusively on the circle's radius and the angle formed at the center.
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Pro Tips
If the angle is 180°, the sector is a semicircle.
If the angle is 90°, the sector is a quadrant.
Angle must be in degrees for the standard formula (πr² × θ/360).
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Fun Facts
"The word 'sector' comes from the Latin 'secare', meaning 'to cut'."
"Pie charts use sectors to represent percentages of a whole."
"In astronomy, Kepler's Second Law states that a planet sweeps out equal areas (sectors) in equal times as it orbits."
