Let’s solve each problem one by one. We’ll use the formula for perimeter of a rectangle:
Perimeter = 2 × (Length + Width)
We are given the perimeter and one side, and we need to find the missing side labeled “L”.
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(1) Perimeter = 26, one side = 9, find L
Use the formula:
26 = 2 × (9 + L)
Divide both sides by 2:
13 = 9 + L
Subtract 9 from both sides:
L = 4
✔ Answer:
(a) 4
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(2) Perimeter = 28, one side = 9, find L
28 = 2 × (9 + L)
Divide by 2:
14 = 9 + L
Subtract 9:
L = 5
✔ Answer:
(c) 5
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(3) Perimeter = 20, one side = 8, find L
20 = 2 × (8 + L)
Divide by 2:
10 = 8 + L
Subtract 8:
L = 2
✔ Answer:
(d) 2
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(4) Perimeter = 28, one side = 7, find L
28 = 2 × (7 + L)
Divide by 2:
14 = 7 + L
Subtract 7:
L = 7
✔ Answer:
(b) 7
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Final Answer:
(1) a
(2) c
(3) d
(4) b
Parent Tip: Review the logic above to help your child master the concept of area worksheet grade 5.
