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Answer:
p=240cm
Step-by-step explanation:
Imagine this is the nine box where each measures 20 cm, to calculate for the side of the big square we must multiply 20 cm by 3.
20cm×3 = 60cm
Now, we have the measurement of the side of the big box.
We will use the formula p=4a to calculate for the perimeter of the big square
p=4(measure of the side)
p=4(60cm)
p=240cm