This application 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 put two known values.