A prism has a uniform cross-section in the shape of a trapezium with parallel sides 8 cm and 10 cm, 5 cm apart. If the prism is 11 cm long, find its volume.
Worked solution (try it first)
Area of the trapezium: half the sum of the parallel sides times the distance between them, 21(8+10)×5=45 cm2.
Volume = cross-section × length: 45×11=495 cm3, option D.