Multiply each dimension by $2.5$.

The sum of the new dimensions will give you the new perimeter.

Find the area of the triangle and the square using the new dimensions.

Side lengths of new dimensions are now $12.5$ ft, $10$ ft, and $7.5$ ft.
$\text{P(original)}=20\ \text{ft}$     $\text{P(new)}=50\ \text{ft}$
$\text{A(original)}=22\text{ ft}^2$   $\text{A(new)}=137.5\ \text{ft}^2$