Two parallel sides of a trapezium are in the ratio 2 : 3 and the distance between them is 12 cm. If the area of the trapezium is 240 cm²; the length of its larger parallel side is :

1. 16 cm

2. 20 cm

3. 24 cm

4. 32 cm

The adjacent sides of a parallelogram are 12 cm and 9 cm. The distance between longer sides is 6 cm; the distance between shorter sides is :

1. 12 cm

2. 9 cm

3. 8 cm

4. 6 cm

The diagonal of a rhombus is 15 cm and its area is 60 cm²; the other diagonal of the rhombus is :

1. 4 cm

2. 8 cm

3. 12 cm

4. 16 cm

The following figure shows the cross-section ABCD of a swimming pool which is a trapezium in shape.

If the width DC of the swimming pool is 6.4 m, depth (AD) at the shallow end is 80 cm and depth (BC) at the deepest end is 2.4 m, find its area of cross-section.