The area of the given figure is :

1. AC x BD

2. $\dfrac{1}{2}\times AC \times BD$

3. $\dfrac{1}{2}\times AB \times BD$

4. $\dfrac{1}{2}\times (AD + BC) \times BD$

If two adjacent sides and a diagonal of a rectangle are x, y and d respectively. The area of the rectangle is :

1. $x \times y$

2. $\dfrac{1}{2} \times\ d^2$

3. $\dfrac{1}{2} \times\ x \times d$

4. $\dfrac{1}{2} \times\ y \times d$

The perimeter of a square is 72 cm, its area is :

1. $900\sqrt{2} \text{ cm}^2$

2. $30\sqrt{3} \text{ cm}^2$

3. 324 cm²

4. 356 cm²

Area of a rhombus is 360 cm². If one diagonal of it is 20 cm; the other diagonal is :

1. 24 cm

2. 18 cm

3. 40 cm

4. 36 cm