Answer:
30 cm
Explanation:
The first one it says 4cm. That means all sides equal to 4 cm.
The second one it says 5 cm. That means all sides equal to 5 cm.
Lets do the second shape.
Since you see 6 sides with 5cm.
You do 6 times 5. Which equals to 30.
You add the label, so 30cm.