A rancher plans to make four identical and adjacent rectanglar pens against the barn each with an area of 225 m² what are the dimensions of each pen that minimize the amount of fence that must be used

You have 2,400 yards of wire fence material and you wish to enclose a rectangular region to form a dog kennel. Your dog kennel is to have 5 runways to keep each dog separated. What are the outer dimension of the rectangular kennel (length/width) that give maximum area?

Please help me with this, thanks!

A length of wire that is 160 cm long is cut into two pieces: one to form an equilateral triangle and the other to form a circle. Where do you cut the wire to makes shapes that enclose a maximum amount of area for the two shapes? Where do you cut the wire to enclose a minimum amount of area for the two shapes?