need to find distance between two circle center

[SaranVenkateshS]

i need to distance between two cirlce centers (x1,y1) (x2,y2).. 

Now i am using  formula  distance = x2 - x1. (in this case my image should be Zero Degree)

in this case if my Image is tilted (angle ) .. my calculation will be Wrong .. 

..

I tested with labview vision assitant to find distance measure option .. (it take cares the tilt postion also ).

So i need some method to find the distance . without error

[udka]

I'm sorry i cannot see the image scenario where you are describing.
-I may suggest you to check IMAQ point Distances if you have vision tool.
-else try euclidean distance between points sqrt(x2-x1)^2+(y2-y1)^2)

-It would be nice if you can add either sample image or code which tried to understand the problem if i'm addressing exact problem.