What process is occurring between structure A and structure B; and structure B and structure C? 
Definitions:
Arc
A smooth curve that often represents a part of the circumference of a circle.
Radius
The distance from the center of a circle to its perimeter.
Point Of Tangency
The exact point where a curve or surface touches another curve or surface without intersecting it, commonly used in geometry and drafting.
Curve Point
A specific point on a curve where the direction changes or any distinctive point that can define the curve's properties.
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