CircularRegion 
    A CircularRegion defines a circular region with a radius, latitude and longitude.
Constructors
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                  constructor(@FloatRange(from = 0.0, to = 100000)   radius: Double, @FloatRange(from = RegionEvent.MIN_LATITUDE, to = RegionEvent.MAX_LATITUDE)   latitude: Double, @FloatRange(from = RegionEvent.MIN_LONGITUDE, to = RegionEvent.MAX_LONGITUDE)   longitude: Double)
Constructor for creating a circular region.