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

Solution:

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=11. p; p || a , v(a,p)=v(b,p) \ \\ 2. q; q||c, v(a,p)=v(c,q) \ \\ 3. S; S=p \cap q \ \\ 4. k; k (S, r=v(a,p)) \ \\ \ \\ x=1



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