Fig. 6.11, ifAB|| CD, then 2EFD is equal to
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2 EFD = 80
EFD = 40°
Step-by-step explanation:
C = 110°[co-interior angles]
Consider g(opp to c)
G= 110°[vertically opposite angles]
G+F+E= 180°[angle sum property]
110°+30°+F= 180°
F=40°
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