Two circles intersection

Hello everyone ! I 'm completely new in SE API and I have some problems. They are stupid, really stupid( and i'm also sorry for my english) but it would be great if you could help me!)
So, I need help in finding intersection points of two circles( coordinates of intersection). It's easy( as i think) but i dont know how to do it:c
I just dont know how to use intersectionpoint at all( or what i must use to find intersections?). Can you give me some examples of using it( something like finding itersectionpoint of two lines).

And again: i'm new in SE API, so i know almost nothing:c

Thak you very much!)