Do The Angle Chasing Dance

Geometry

In the figure, with ∠BAC=40∘, \angle BAC = 40 ^ \circ, what is the measure of ∠ABC \angle ABC (in degrees)?


Clarification: HFAC,DFG,EDCB,IHGJHFAC, DFG, EDCB, IHGJ are all straight lines.

Md Khairul Hasan by Md Khairul Hasan
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