Here's how to calculate the perimeter of the blue part of the flag: Step 1: Identify the shape and its dimensions. The blue part of the flag is a rectangle. From the image, its length is $24 \text{ cm}$ and its width is $10 \text{ cm}$. Step 2: Use the formula for the perimeter of a rectangle. $$ \text{Perimeter} = 2 \times (\text{length} + \text{width}) $$ Step 3: Substitute the values and calculate. $$ \text{Perimeter of blue part} = 2 \times (24 \text{ cm} + 10 \text{ cm}) $$ $$ \text{Perimeter of blue part} = 2 \times (34 \text{ cm}) $$ $$ \text{Perimeter of blue part} = 68 \text{ cm} $$ The perimeter of the blue part of the flag is $\boxed{\text{68 cm}}$. That's 2 down. 3 left today — send the next one.