ABCD is a rhombus such as ABCD. 40° then ADB
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Step-by-step explanation:
∠COB=90
o
In △COB
∠COB+∠OBC+∠OBC=180
o
∠OBC=180
o
−90
o
−40
o
∠OBC=50
o
∠OBC=∠ADB ....[AD || BC]
∠ADB=50 .
Hope it helps you
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