5. The correct answer is (C). Extend BE to F (as shown in the diagram below).
m
∠EFD 5 m
∠ABE 5 40°. m
∠FED must equal 110° because the three interior angles of
DDEF must total 180° in measure. Since
∠BED and
∠FED are supplementary (the sum
of their measures is 180°), m
∠BED 5 70° (x 5 70).
x
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