Coordinate Geometry

[geo]
(point A 119 220)
(point B 281 219)
(point C1 293 284)
(equilateralfar C A B C1)
(circle3points t1 C A B)
(segment d1 C A)
(segment d2 A B)
(segment d3 C B)
(middle D B C)
(middle E C A)
(segment d4 E B)
(segment d5 D A)
(intersect F d4 d5)
(circle t2 F D)
(pointoncircle G t2 185 128)
(symmetric H F G)
(segment d6 G F)
(perpendicular d7 F d6)
(intersectlinecircleleft I d7 t2)
(symmetric J F I)
(segment d8 G J)
(segment d9 J H)
(segment d10 H I)
(segment d11 I G)
[/geo]

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