From: [the mentor]
To: Student 4
Date: Sep 9 2002 10:47AM
Subject: Re: GeoPOW: Congruent Rectangles  posted 09/02/02
>the perimeter is 114 square units
Hi, [Student 4]. Your answer is right, as you saw, and you did show all of your
work. But what you didn't do was _explain_ your work. That's another important
step in the process.
So while you've chosen a good strategy and you've got the math all correct,
you also need to explain what you did. You should describe the steps that you
took and do it in such a way that another student would be able to learn from
reading your work. Also, once you're finished, try to reflect on your work 
can you check your work (besides using our answer check)? Does your answer
seem reasonable to you? You can read more about what this part might look
like on the page that is referenced below.
See what you can do with this. I look forward to seeing your revision.
[the mentor]
>
>used X and Y as sides of one of the smaller rectangles. X is the
>longer side.
>
>4y=3x x=4/3y
>7xy=756
>7 4/3yy=756
>3/4x4/3yy=108x3/4
>324/4=81
>yy=81
>y=9
>4x9=3x 36=3x
>36/3=12
>12=x
>5x+6y
>60+54=114 square units

Summary:
Problem Solving Interpretation: Practitioner
ProblemSolving  Strategy: Practitioner
Problem Solving Accuracy: Practitioner
Communication Completeness: Apprentice
Communication Clarity: Novice
Communication Reflection: Novice
(For an explanation of scores see http://mathforum.org/pow/scoring.html.)

[the mentor], for the Geometry Problem of the Week
http://mathforum.org/geopow/
