PDF chapter test TRY NOW

Complete the following statement with the help of learned property or definition for the given parallelogram \(ABCD\).
 
EX_5_1_2.png
 
1. \(BC =\) .
 
2. \(m∠BCD = m∠\).
 
3. \(OB =\) .
 
4. \(m∠DAB + m∠ABC =\) i\(°\).