Sector Area Calculator
Radius (r)
units
60°
Radius (r)
units
Arc Length (L)
units
Circle Area (A)
square units
60°
Results
Formulas Used
- Sector Area = (θ/360°) × πr²
- Sector Area = (L/2πr) × πr²
- Sector Area = (θ/360°) × A
Where:
- θ = central angle in degrees
- r = radius
- L = arc length
- A = circle area
Sector Area
-
square units
Arc Length
-
units
Radius
-
units
Central Angle
-
degrees
About Circular Sectors
A circular sector is a portion of a circle enclosed by two radii and an arc. The area of a sector is proportional to the central angle that subtends it.
- When the angle is 360°, the sector becomes a full circle
- When the angle is 180°, the sector becomes a semicircle
- The arc length is proportional to the central angle
- The sector area is proportional to the central angle