# Degree Values after conversion [closed]

Hi All, I have few sets of pair coordinates. For each pair, i would like to get the value of the degree and here is my code

```
double deg = atan((b.y-a.y)/(b.x-a.x)) * 180 / PI;
std::cout << "deg" <<deg<< std::endl;
file<<deg<<",";
```

From the value, it can be resulted for 40 degree. As we know, there is another degree which similar to 40 degree which is 180+40 = 220 degree.

So far, by using the formula, i had never encountered a degree more than 180. Is it possible to have that value i.e 220 degree after arctan process?

use atan2. Where is opencv problem?

owh sorry, I'm using this in my opencv c++. I thought this would be the right forum to discuss.

Anyway thanks!! alot