Sector Area Calculator
Find the area and arc length of a circle sector.
A sector is a 'pie slice' of a circle.
The math behind it
area = (angle ÷ 360) × π × r². Arc length = (angle ÷ 360) × 2πr.
Worked example
r 5, 60° → area 13.1, arc 5.24.
FAQ
Full circle?
At 360° you get the whole circle's area and circumference.