Answer:
54
Explanation:
Since we are trying to find the amount of fencing needed to surround an area, we need the perimeter.
The formula for perimeter is 2 ( L + W ) with L being length and W being width.
Let's just plug it into the formula.
2 ( 15 + 12 )
2 ( 27 )
54
The perimeter of the area is 54 feet, so we need 54 feet of fencing.