The difference between two parallel sides of a trapezium is 4 cm. The perpendicular distance between them is 19 cm. If the area of the trapezium is 475 cm2, find the lengths of the parallel sides (R.R.B. 2002)
A) a = 27, b = 23
B) a = 23, b = 27
C) a = 21, b = 15
D) a = 28, b = 18
Let the two parallel sides of the trapezium be a cm and b cm.