Posted by manzana on August 29, 2002 at 13:21:16:
In Reply to: Hint? posted by Ryan on August 29, 2002 at 09:39:04:
I think you do not need the identity. It is a right cone, a slice is a right triangle where 9=r^2 + h^2. You want to maximize the area of the triangle (or the rectangle rh). You know h=sqrt(9-r^2) and the area a of the rectangle=rh. So the area = r* sqrt(9-r^2). Just maximize.
have fun, la manzana in rtp NC
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