A rectangular piece of paper was folded to form the figure as shown as below. Find the perimeter of the rectangular piece of paper when it was unfolded. Ans: ___ cm

1. Determine the width of the unfolded rectangular paper

The width of the paper is the width of the right vertical leg, which is given as $2$ cm.

2. Determine the length of the unfolded rectangular paper

The folded figure consists of two vertical legs and a horizontal top section. The inner horizontal distance is $9$ cm. The width of each leg is $2$ cm. The horizontal top section has a length of $2 + 9 + 2 = 13$ cm. The paper is folded at $45^\circ$, so the folded part of each leg has a length equal to its width, which is $2$ cm. The lower vertical section of each leg is $5$ cm. Therefore, the total length of the unfolded paper is $5 + 2 + 13 + 2 + 5 = 27$ cm.

3. Calculate the perimeter of the unfolded rectangular paper

Perimeter $= 2 \times (\text{Length} + \text{Width}) = 2 \times (27 + 2) = 2 \times 29 = 58$ cm.