>>11124225It's attaching circle shaped rubber out on two wheels of smaller radius.
Operation like this can be done various ways, but I think your point in this transformation lays in zooming, continual movement with additional zooming and finding circumference of whole operation to be the same as circumference of original circle.
First you find out how far apart are the circles, count hypotheneuse of those triangles twice, then you find a circumference of circle cuts and align it all for pi, you should know the size of one circle and distance or both circles.
It's like drawing triangles, just with pi, you need to know 2 from 3 to find another.
Pythagorean theorem can help you to find a straight line and then there is equation for circle segments.
