The circular black arrow indicates the measure of a full rotation in degrees and the angle measure in radians is shown in red. Based on this, the relationship between radians and degrees is: 2π
The app is good ,you can easily find what's the formula and how to solve it because of this app our stress and fear in mathematics has changed but the only thing i hate on this app is the premium you know i should prefer watching ads than subscribing to premium it's so expensive:'(.