The length of one diagonal of a rhombus of area 24 cm² is 6 cm. The length of the other diagonal is :

1. 4 cm

2. 8 cm

3. 12 cm

4. 16 cm

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 equilateral triangle of side 4 cm is :

1. 6.928 cm²

2. 6.298 cm²

3. 5.928 cm²

4. 5.528 cm²