The cross-section of a tunnel has the form of a rectangle surmounted by a semi-circle. The perimeter of this cross section is 18 meters. For what radius of the semi-circle will the cross-section have maximum area?

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@Shadowys

|dw:1354534273826:dw| thats what i get as a drawing but i cant seem to get the good equations :/

okay, for this question, you have two equations. one is the perimeter, and the other is the area. can you formulate both equations?

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