find the area of trapezium whose parallel sides are 10 cm and 18 cm long , and the distance between them is 15 cm .
"explanation : area of a trapezium = 1 / 2 ( sum of parallel sides ) * ( perpendicular distance between them ) = 1 / 2 ( 10 + 18 ) * ( 15 ) = 210 cm 2 answer : option e"
quadrilateral_area(15, 18, 10)