12. Four mark exercise problems IV

A ground is in the form of isosceles trapezium with parallel sides measuring \(42 \ m\) and \(36 \ m\) long. The distance between the parallel sides is \(30 \ m\). Find the cost of levelling it at the rate of \(₹135\) per \(sq. \ m\).

 

Answer:

 

Area of the ground \(=\)  \(sq. \ cm\)

 

The cost of levelling the ground \(=₹\)