One side of a rectangular field is 4 m and its length along diagonal is 5 m. What is the area of the field? August 4, 2021July 15, 2019 by admin One side of a rectangular field is 4 m and its length along diagonal is 5 m. What is the area of the field? A. 12 sq m B. 4√14 sq m C. 20 sq m D. 15 sq m