A dog breeder has 10 meters of  fencing with which to build a rectangular dog pen. 

What values of width and length (in meters) will enclose the largest area?


Below the red rectangle represents the floor of the dog pen.  Use your mouse to "drag" 

the labeled point to experiment  with different widths. The blue curve represents the graph of the area of the rectangle as a function of its width.


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This is a prototype of JavaSketchpad, a World-Wide-Web component of The Geometer's Sketchpad. Copyright ©1990-1998 by Key Curriculum Press, Inc. All rights reserved. Portions of this work were funded by the National Science Foundation (awards DMI 9561674 & 9623018).