The symmetric cross inscribed in a circle of radius .
Find the area of the cross as a function of and find the value of that maximizes the area.
The cross inscribed in a circle is
.
Apply derivative on each side with respect to .
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
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.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=526332d14ea94fb5151414e0ef474716.png\")
of the cross as a function of ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8da2268e35b6b6daab9c47f71c4c8bf4.png\")
and find the value of ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8da2268e35b6b6daab9c47f71c4c8bf4.png\")
that maximizes the area.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=59d151cb1f71d3bf46ec72cde526d85c.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=96ad709217d0277b0e5d542092c7c3ff.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=be30ff8d0f272abacb1a42166b17e0b5.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=22a3977e6e4ac09452bb62ed15f4d903.png\")
..