The distance between the parallel sides of a trapezium of area 27.5 cm² is 5 cm. If the length of one of those two parallel sides is 7.5 cm, then the length of the other side is :

1. 3.5 cm

2. 7 cm

3. 8.5 cm

4. 9 cm

The area of the triangle whose three sides are 13 cm, 14 cm and 15 cm, is :

1. 72 cm²

2. 84 cm²

3. 92 cm²

4. 96 cm²

The lengths of two adjacent sides of a parallelogram are 12 cm and 10 cm respectively. If the distance between the longer sides be 8 cm, then the distance between two shorter sides will be :

1. 9.1 cm

2. 9.2 cm

3. 9.4 cm

4. 9.6 cm