Maureen Curran and Mary Lou Aalbers
Hazelwood School District
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Perimeter
Area
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•You will need to click the mouse to show the answers foractivities. This will allow you to control the timing of answersshown.
•We suggest that students keep a journal
•It is critical for students to use writing skills to explain theiranswers
•Please take time to discuss possible solutions to problems.
The following lesson is addressing these standards:
•Extend student understanding of the process and structure for measurement. (MO 1.4, 2.6, 2.7)
•Apply the concepts of perimeter and area (MO 2.5, 3.8, 4.1)
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Farmer Jones bought Farmer Jones bought three horsesthree horses..
He must fence in his barnyard to keep his horses from straying.
He has 72 feet of fencing available and wants to get the
largest corral for his horses.
Here are the designs he came up with.
24
12
24
12
27
27
99
20
20
20
20
18
18
18
18
He wants the largest space for his horses to run and has only 72 feet of fencing.
27
27
99
Would this work?
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27
27
99
YES!
27+9+27+9=72 feet
18
18
18
18
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Would this work?
18
18
18
18
YES!
18+18+18+18=72 feet
20
20
20
20
Would this work?
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20
20
20
20
NO! 20+20+20+20=80 feet
Not enough fencing
24
12
24
12
Would this work?
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24
12
24
12
YES! 24+12+24+12=72
feet
27
27
99
18
18
18
1824
12
24
12
18
18
18
18
In your journal explain why Design B is the best
choice.
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