Answer:
16 units
Step-by-step explanation:
The perimeter is the sum of the lengths
Add up the lengths as shown
3+2+1+2+3+1+1+3
15, 18, 21
3, 6, 9, 12, 15, 18, 21...
3 x 5 = 15
3 x 6 = 18
3 x 7 = 21
Hope this helps! :)
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