Area Of A Rhombus - GCSE Maths - Steps, Examples & Worksheet The area of a rhombus is calculated by using the side lengths, instead of the lengths of the diagonals. Practice area of a rhombus questions 1. Find the area of the rhombus below: 24m^2 24m2 48m^2 48m2 16m^2 16m2 48m 48m 2. The rhombus MNOP MNOP has the following information: MP=250cm MP = 250cm NO=4.5m NO = 4.5m