Parallels and one secant

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

Correct answer:

x =  1

Step-by-step explanation:

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

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