Practise the method.Example 1A cuboid measures 4cm by 2cm by 3cm. Find its volume, in cm3.CuboidCuboidCuboid with front width 4 cm, vertical height 2 cm and depth 3 cm. Diagram not to scale. Use the labelled measurements.4 cm2 cm3 cmDiagram not to scaleShow worked answerAnswer: 24Multiply the three perpendicular dimensions.4×2×3=24cm3.Example 2A right triangular prism has cross-section base 8cm, perpendicular height 5cm and prism length 6cm. Find its volume, in cm3.Right triangular prismRight triangular prismPrism with a right triangular cross-section: perpendicular base 8 cm, height 5 cm; prism length 6 cm. Diagram not to scale. Use the labelled measurements.8 cm5 cm6 cmDiagram not to scaleShow worked answerAnswer: 120Cross-section area = ½ ×8×5=20cm2.Multiply by the prism length: 20×6=120cm3.Example 3A right triangular prism has volume 80cm3. Its cross-section has perpendicular base 8cm and height 4cm. Find the prism length x, in cm.Right triangular prismRight triangular prismPrism with a right triangular cross-section: perpendicular base 8 cm, height 4 cm; prism length x cm. Diagram not to scale. Use the labelled measurements.8 cm4 cmx cmDiagram not to scaleShow worked answerAnswer: 5Cross-section area = ½ ×8×4=16cm2.Length =1680=5cm.