Parallels and one secant

There are two different parallel lines a, b and a line c that intersect the two parallel lines. Draw a circle that touches all lines at the same time.

Correct result:

x =  1


1.p;pa,v(a,p)=v(b,p) 2.q;qc,v(a,p)=v(c,q) 3.S;S=pq 4.k;k(S,r=v(a,p))  x=1

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