Focus on the pronunciation of perimeter
English definition of “perimeter”
/pəˈrɪm·ɪ·t̬ər/ n [C]
› the outer edge of an area or the border around it: Several bombs landed near the perimeter of the airport. › geometry The perimeter is the outer edge of a flat shape or area. › geometry Perimeter is also the distance around the outer edge of a flat shape.