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1. The area of the trapezium, if the parallel sides are measuring \(8 \ cm\) and \(10 \ cm\) and the height \(5 \ cm\) is .
 
2. In a trapezium if the sum of the parallel sides is \(10 \ cm\) and the area is \(140 \ sq. \ cm\), then the height is .
 
3. When the non-parallel sides of a trapezium are equal then it is known as .