Function angleRadian

angleRadian(lineOrPoint: Point | Line, b?: Point): number
Returns the angle in radians of a line, or two points
```
Lines.angleRadian(line);
Lines.angleRadian(ptA, ptB);
```
Parameters
- lineOrPoint: Point | Line
- Optionalb: Point
Returns number
- Defined in geometry/src/line/index.ts:104