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Teacher
Tips
Perimeter
Area
Maureen Curran and Mary Lou Aalbers
Hazelwood School District
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begin
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activities. This will allow you to control the timing of answers
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•We suggest that students keep a journal
•It is critical for students to use writing skills to explain their
•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)
slide
Farmer Jones bought three
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.
27
20
9
9
20
20
27
20
18
24
18
18
12
12
24
18
He wants the
largest space for his
horses to run and
has only 72 feet of
fencing.
Would this work?
27
9
9
27
Click for
27
9
9
27
YES!
27+9+27+9=72 feet
Would this work?
18
18
18
18
Click for
18
18
18
18
YES!
18+18+18+18=72 feet
Would this work?
20
20
20
20
Click for
20
20
20
20
NO! 20+20+20+20=80 feet
Not enough fencing
Would this work?
24
12
12
24
Click for
24
12
12
24
YES!
24+12+24+12=72 feet
27
9
9
27
18
24
18
18
12
18
12
24
18
18
18
18