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Weekly Problem 26 - 2007

Stage: 3 and 4 Challenge Level: Challenge Level:1
Angle CBE = (180-75-60)degrees = 45 degrees
Angle DEB= (180-65-60)degrees = 55 degrees
Angle GHB= (45+55)degrees = 100degrees (exterior angle of a triangle)
AngleHGC = (100-60)degrees = 40 degrees (exterior angle of a triangle)

This problem is taken from the UKMT Mathematical Challenges.

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