Arc area, arc length, chord length calculator

Radius(r):
Arc Angle (a):
Arc area:
Arc Length:
Chord Length:

1. Area of ​​a circle = π * r2

2. Circumference of a circle = 2 * π * r

3. Arc area (shaded) = r2 * (a - sin(a)) / 2

4. Arc length = r * a

( Note: The unit is radians.)