Find the perimeter

To find the perimeter of the given L-shaped polygon, we need to sum the lengths of all its sides. First, we'll convert all measurements to a consistent unit, centimeters.

Step 1: Convert all measurements to centimeters.
We have the following lengths:

• $3 \text{ cm}$
• $3 \text{ cm}$
• $4 \text{ cm}$
• $7 \text{ cm } 5 \text{ mm}$
• $7 \text{ cm } 5 \text{ mm}$

Since $1 \text{ cm} = 10 \text{ mm}$, we convert $5 \text{ mm}$ to $0.5 \text{ cm}$.
So, $