Measurement problem we solved today

Again with another great maths session with our wonderful teacher. We had to solve this difficult problem about fences and the area. Mr.Simi is the main character in the problem. He wants the biggest space(area) to work in and to build his family's plantation. I suggested he could do a rectangle with his  180 m wire. I estimated 60 for the height and 30 for the width. I multiplied, and  there I got the biggest area could add.