How to display the radius in MKCircle on Map in meters

Question

I need to draw a circle of a radius 1.23 metre on MkMapView using MKCircle. How would i show that on the map. I used the following ,

  r = 1.23;// in metres.
  circle = [MKCircle circleWithCenterCoordinate:location radius:r];

But when i draw it on the map it looks like more than 1km on the MKMapView. Could someone please tell me how i could represent a circle of radius 1.23 metre on the map??

This is mainly to show the accuracy of the location, so the radius indicates the accuracy of the location.