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Question

In the given figure, ABD=70o,ADB=30o. Then BCD is __________.
726033_b7feebe65f564a9d890e309e9d13cae7.png

A
90o
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B
80o
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C
100o
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D
120o
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Solution

The correct option is D 100o
BAD=180(ADB+ABD)=1803070=80o
BAD and BCD are supplementary angles.
BCD=180oBAD=18080=100o

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