Answer:
42m
Explanation:
The formula for perimeter of a rectangle is P=2(l+w)
P=2·(12+9)=42
A rectangle would have two sides 12 meters long and two sides 9 meters wide.
The perimeter is the sum of the four sides.
12 + 12 + 9 + 9 = 42
The perimeter is 42 meters
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