Calculate the area of each of the following shapes:

$$\text{Area} = 45\, \text{m}^2$$

The area of shape (a) is $\boxed{45\, \text{m}^2}$.

$$\text{Area} = \frac{1}{2} \times 15\, \text{cm}^2$$ $$\text{Area} = 7.5\, \text{cm}^2$$

The area of shape (b) is $\boxed{7.5\, \text{cm}^2}$.

$$\text{Area} = 39\, \text{m}^2$$

The area of shape (c) is $\boxed{39\, \text{m}^2}$.

$$\text{Area} = \frac{1}{2} \times 24.8\, \text{cm}^2$$ $$\text{Area} = 12.4\, \text{cm}^2$$

The area of shape (d) is $\boxed{12.4\, \text{cm}^2}$.