ABCD is a rhombus such that angle acb is equal to 40 degree
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acb can't be a angle abc can
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ABCD is a rhombus such that ∠ACB=40
o
then ∠ADB is ___ .
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ANSWER
∠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
o
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