App description

Calculation formula:

1.Round area = π * r²

2.Circumference length = 2 * π * r

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

4.Arc length = r * a

(Note: the unit is radians.)

Usage example

Input data:

Radius: 2

Arc angle (a): 45

Click "Calculate" to output data

Arc area: 88.2982

Arc length: 90

Chord length: 1.9487