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# NormalizedCircle

The center point and radius of a 2D circle.

```
struct NormalizedCircle
```

## Topics

### Creating a normalized circle

[`init(center: NormalizedPoint, radius: CGFloat)`](/documentation/Vision/NormalizedCircle/init(center:radius:))

Creates a circle with the specified center and radius.

[`static var zero: NormalizedCircle`](/documentation/Vision/NormalizedCircle/zero)

A circle object centered at the origin, with a radius of zero.

### Inspecting a normalized circle

[`let center: NormalizedPoint`](/documentation/Vision/NormalizedCircle/center)

The circle’s center point.

[`let radius: CGFloat`](/documentation/Vision/NormalizedCircle/radius)

The circle’s radius.

### Determining whether the circle contains a point

[`func contains(NormalizedPoint) -> Bool`](/documentation/Vision/NormalizedCircle/contains(_:))

Returns a Boolean value that indicates whether this circle, including its boundary, contains the specified point.

[`func contains(NormalizedPoint, inCircumferentialRingOfWidth: CGFloat) -> Bool`](/documentation/Vision/NormalizedCircle/contains(_:inCircumferentialRingOfWidth:))

Returns a Boolean value that indicates whether a ring around this circle’s circumference contains the specified point.

### Getting the bounding circle

[`static func boundingCircle(for: [NormalizedPoint]) -> NormalizedCircle`](/documentation/Vision/NormalizedCircle/boundingCircle(for:))

Creates the smallest circle that encloses the points you specify.


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