Kreisrechner + Bogenrechner + Kreisflächenrechner
This app has two calculators.
1) Circle Calculator
2) Arc Calculator
1) Circle Calculator:
In this calculator you will have to put only one value from (radius, diameter, circumference, area), and it will find the rest.
2) Arc Calculator:
In this calculator you can find arc length, central angle, chord length, radius, height, sector area, segment area.
All you have to do is to put two known values.