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

If the perimeter of a square is 80 cm, then its area is

1. 800 cm²

2. 600 cm²

3. 400 cm²

4. 200 cm²

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

If the area of trapezium is 64 cm² and the distance between parallel sides is 8 cm, then sum of its parallel sides is

1. 8 cm

2. 4 cm

3. 32 cm

4. 16 cm