Volume of prism = base area x height Base area = area of a trapezium = \(\frac{1}{2}(a + b)\times h = \frac{1}{2}(10 + 8)\times 5 = 9 \times 5 = 45cm^2\) Height = 11cm Therefore, volume of prism = 45 x 11 = \(495cm^3\)