English: Construction of a general equilateral pentagon using four congruent circles: c1, c2, c3 and c4. First pentagon's vertex (with internal angle alpha) corresponds with c2's center and also is the intersections of c1 and c3. Second pentagon's vertex (with internal angle beta) corresponds with c3's center and also is the intersection of c2 and c4. Pentagon's third vertex (with internal angle gamma) coincides with c4's center, while fourth vertex (with internal angle delta) is the point of c4 and c1 intersection. Last pentagon's vertex (with internal angle epsilon) is in the center of c1.