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### `polar(x, y)`
Converts a cartesian coordinate given with `x` and `y` to a polar coordinate (radius and angle).

Returns:
An object `{ radius: resultRadius, angle: resultAngle }`.

#### Example:

The result in `polarCoordinate` will be `{ radius: 50, angle: 0.6435011087932844 }`.
```javascript
let polarCoordinate = gmynd.polar(40, 30);
```