ABCD is a trapezium in which AD is parallel to BC. If ∠A=110° and
∠D=130°. What are the measures of the other two angles?
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Answer:
first draw a trapezium ABCD
A+B+C+D=360
110+B+C+130=360
240+B+C=360
B+C=360-240
B+C=120
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