One side of a parallelogram is 6 m. If the area of a parallelogram is 30 m², then its height corresponding to the side is :

1. 10 m

2. 5 m

3. 12 m

4. 14 m

The length of a diagonal of a square is 8 cm. The area of the square is :

1. 64 cm²

2. 32 cm²

3. 128 cm²

4. 256 cm²

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