Posted by Courtney on .
Polly decides to use a wall of the house as one sideof the rectangular dog pen. She plans to use the 24 ft. of fencing (1 ft. sections) for the other 3 sides. What are the dimensions ofthe best dog pen for polly's poodle? Explain

geometry 
Ms. Sue,
I helped you with the last problem. Now it's your turn.
What do you think are the best dimensions?
We'll be glad to check your answer. 
geometry 
Courtney,
A = l + w
the best dimensions would be lenght 10 feet and width 4 feet
24  4 = 20
20 divided by 2 (lenght) 10
10 by 10 by 4 = 24 
geometry 
Ms. Sue,
If one length is along the house, then you still have 24 feet to divide among three sides.

geometry 
Courtney,
24 divided by 3 (sides) = 8
8 divided by 2 (sides) = 4
24  4 = 20
20 divided by 2 (sides) = 10
10 by 10 by 4 = 24 feet of fencing 
geometry 
Ms. Sue,
You don't need fencing along the wall of the house.
How about dimensions of 12 by 6, with 12 feet along the house?
12 + 6 + 6 = 24 feet of fencing. 
geometry 
mike,
i almost thought this was an optimization problem

geometry 
Courtney,
i kinda understand but not sure how i write the problem up