Practise the method.Example 1A cuboid measures 5cm by 3cm by 4cm. Find its volume, in cm3.CuboidCuboidCuboid with front width 5 cm, vertical height 3 cm and depth 4 cm. Diagram not to scale. Use the labelled measurements.5 cm3 cm4 cmDiagram not to scaleShow worked answerAnswer: 60Multiply the three perpendicular dimensions.5×3×4=60cm3.Example 2A right triangular prism has cross-section base 10cm, perpendicular height 6cm and prism length 6cm. Find its volume, in cm3.Right triangular prismRight triangular prismPrism with a right triangular cross-section: perpendicular base 10 cm, height 6 cm; prism length 6 cm. Diagram not to scale. Use the labelled measurements.10 cm6 cm6 cmDiagram not to scaleShow worked answerAnswer: 180Cross-section area = ½ ×10×6=30cm2.Multiply by the prism length: 30×6=180cm3.Example 3A right triangular prism has volume 105cm3. Its cross-section has perpendicular base 6cm and height 5cm. Find the prism length x, in cm.Right triangular prismRight triangular prismPrism with a right triangular cross-section: perpendicular base 6 cm, height 5 cm; prism length x cm. Diagram not to scale. Use the labelled measurements.6 cm5 cmx cmDiagram not to scaleShow worked answerAnswer: 7Cross-section area = ½ ×6×5=15cm2.Length =15105=7cm.