3. Calculate the unknown 'x' in the trapezium

In the following figure \(IJKL\), \(IL || JK\) and \(IJ = LK = 42 cm\) with \(IL =\) 84 \(cm\) and \(JK = x cm\). Find the value of \(x\).
 
EX_11_1.png
 
The value of \(x\) is  \(cm\).
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