A swimming pool is 50 metres long and 15 metres wide. Its shallow and deep ends are $1\dfrac{1}{2}$ metres and $4\dfrac{1}{2}$ metres deep respectively. If the bottom of the pool slopes uniformly, find the amount of water required to fill the pool.

Area of a triangle is 30 cm². If its base is 10 cm, then its height is

1. 5 cm

2. 6 cm

3. 7 cm

4. 8 cm

Area of a parallelogram is 48 cm². If its height is 6 cm then its base is

1. 8 cm

2. 4 cm

3. 16 cm

4. None of these

If d is the diameter of a circle, then its area is

1. πd²

2. $\dfrac{πd^2}{2}$

3. $\dfrac{πd^2}{4}$

4. 2πd²