PLEASE SOLVE THIS I WILL MARK YOU THE BRAINLIST ANSWER
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answer of your question
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Consider triangle QOB and COD,
ANGLE AOB = ANGLE COD
ANGLE OAB = ANGLE OCD
BY AA CRITERIA,
∆AOB ~ ∆COD
ar(∆AOB). = AB²
ar(∆COD). DC²
=21cm²..
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