what is the formula of a trapezium
= 1 / 2 Ã (sum of parallel sides) Ã (distance between them). Formula of Area of a trapezium = 1/2 Ã (sum of parallel sides) Ã (distance between them). 1. Two parallel sides of a trapezium are of lengths 27 cm and 19 cm respectively, and the distance between them is 14 cm.Find the area of the trapezium.. The area of a trapezium is 352 cm2 and the distance between its parallel sides is16 cm. If one of the parallel sides is of length 25 cm, find the length of the other. Solution: Let the length of the required side be x cm.