Final Answer:
A. 150 feet
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Explanation:
Kayla wants to build a fence around her backyard. That means she needs to go all the way around it — that’s called the perimeter.
Her backyard is a rectangle. To find the perimeter of a rectangle, you add up all four sides.
Length = 30 feet
Width = 45 feet
So the four sides are:
Top = 30 feet
Bottom = 30 feet
Left side = 45 feet
Right side = 45 feet
Now add them:
30 + 30 + 45 + 45 = 150 feet
That’s how much fence she needs to buy!
Also, notice option D says “1350 square feet” — that’s area, not perimeter. We’re looking for length (feet), not space (square feet). So we ignore that.
Answer: A. 150 feet
Parent Tip: Review the logic above to help your child master the concept of 5th grade math worksheet area and perimeter.
