Optimization - Three Pens  Oops! The GeoGebra applet did not
load correctly. Please reload your browser page and keep your
fingers crossed!  A farmer has exactly 1200 feet of fencing and
needs to create a rectangular enclosure with three pens, as
shown above. What should the dimensions of the enclosure be, to
create the maximum area?  As you move the blue dot, the total
length of fencing, 1200 feet, remains constant.