Yes, circles that share one and only one point are tangent to each other.
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Nothing "happens". They meet, and the rays continue merrily along their ways, never to meet again!
orgin? or intersection?
No, they meet at a single point.
3 and they meet in a single point called Circumcentre
If two circles are drawn using the same centre, the two lines of the circles are parallel as they don't meet each other.Two straight lines (think of railway tracks) are drawn next to each other, but never meet, they are parallel lines.