UPSKILL MATH PLUS

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Complete the following statement with the help of learned property or definition for the given parallelogram \(ABCD\).
 
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1. \(BC =\) .
 
2. \(m∠BCD = m∠\).
 
3. \(OB =\) .
 
4. \(m∠DAB + m∠ABC =\) i\(°\).