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The area of trapezium is 120 \(cm²\) and the length of the parallel sides \(a\) is 8 \(cm\) and \(b\) is 4 \(cm\). Find the height.
 
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Answer: The height of trapezium \(h\) is  \(cm\).
 
[Note: Enter the answer by rounding off to the nearest whole number.]