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Answer:
360 degrees = 68 + 31 + 115 + GJ
GJ = 360 -68 -31 -115
GJ = 146
Inscribed Angle = 1/2 of intercepted arc
Angle GHJ = 146 / 2 = 73 degrees
Angle GIJ = 146 / 2 = 73 degrees
Source: http://www.1728.org/circangl.htm
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