Originally Posted by
AlphaRock A window has the shape of a rectangle and the upper portion's shape is a semicircle connected with the rectangle's upper side.
The perimeter = 15 units = 2r+2l+(pi)r
What is the ratio of the circle's radius to the height of the rectangle so that the area of the window is a maximum?
I know how to get the maximum area. But I don't know what the "ratio of the circle's radius to the height of the rectangle" means.