Sector Area Calculator
Calculate circular sector area from a radius and central angle between 0° and 360°.
Formula
A = πr² × angle/360.
Radius: 4 in · Area in m² ≈ pi×(4 in × 0.0254 m/in)^2×(90)÷360 · Area in cm² ≈ (0.008107319666)×10000
How to use
- Enter the radius and unit.
- Enter the central angle in degrees.
- Read the area in m² and cm².
Examples
- r = 1 m, angle = 90°: A ≈ 0.785398 m².
Frequently asked questions
Which angle should I enter?
Use the angle at the center, in degrees.
What is a sector?
The region enclosed by two radii and their connecting arc.
What happens at 360°?
The sector becomes the whole circle.
Sources
Updated: