# innerRadiusRatio property

The ratio of the inner radius of a star with the outer radius.

When making a star using StarBorder, this is the ratio of the inner radius that to the outer radius. If it is one, then the inner radius will equal the outer radius.

For polygons created with StarBorder.polygon, getting this value will return the incircle radius of the polygon (the radius of a circle inscribed inside the polygon).

Defaults to 0.4 for stars, and must be between zero and one, inclusive.

## Implementation

```
double get innerRadiusRatio {
// Polygons are just a special case of a star where the inner radius is the
// incircle radius of the polygon (the radius of an inscribed circle).
return _innerRadiusRatio ?? math.cos(math.pi / points);
}
```