8. Estimate the lengths of the rhombus

1. \(ABCD\) is a rhombus. If \(∠ACB =\) 18\(°\), find \(∠ADB\).
 
\(∠ADB =\) \(°\).
 
2. The diagonals of the rhombus are 42 \(cm\) and 56 \(cm\). Find the length of a side of the rhombus.
 
The side length of the rhombus is  \(cm\).
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