Answer: Perimeter of backyard is 36 m.
Explanation:
Since we have given that
Length of rectangular backyard = 12.74 meters
Width of rectangular backyard = 5.45 meters
We need to estimate to the nearest whole number.
So, 12.74 → 13 meters
5.45 → 5 meters
So, Perimeter of rectangular backyard is given by

Hence, perimeter of backyard is 36 m.