Introduce your students to the concept of cross-sections in 3D objects with our clear and engaging Cross-sections of 3D Objects POWERPOINT! This teacher-friendly resource helps build foundational geometry knowledge by explaining how slicing 3D shapes reveals a range of 2D forms. With step-by-step visual examples and interactive slides, this presentation is perfect for whole-class modelling, small group instruction or review sessions.

The PowerPoint begins by defining what a cross-section is and demonstrating how slicing affects the shape and size of the resulting 2D face. From prisms to pyramids, students are shown multiple examples of common geometric solids and how different slicing angles produce varying outcomes. Interactive opportunities are included throughout to allow students to predict, draw and discuss possible cross-sections using mathematical language.

Cross-sections of 3D Objects POWERPOINT is a versatile resource that supports a range of learning styles, combining clear explanation with strong visual modelling. Use alongside real 3D models or shape manipulatives to deepen understanding and connect digital content to hands-on learning. Ideal for middle and upper primary students, this presentation helps make abstract geometry concepts accessible and engaging.

Key Learning Outcomes:

• ✅ Define and describe cross-sections in 3D shapes
• ✅ Identify how slicing direction affects the resulting 2D shape
• ✅ Distinguish between parallel, angled and vertical slicing
• ✅ Recognise cross-sections in right prisms, non-right prisms and pyramids
• ✅ Use spatial reasoning to predict and sketch cross-sectional shapes

What’s Included:

• PowerPoint presentation with clear definitions and visual examples
• Slides covering cross-sections from a variety of 3D solids
• Interactive elements to prompt student predictions and drawing
• Opportunities for whole-class modelling and guided discussion

Materials Needed:

• Device with PowerPoint installed
• Interactive whiteboard or screen for display
• Paper, rulers and pencils for student sketches
• Optional: 3D shape models or real-world objects (e.g. fruit, pyramids)

How to Use:

1. Begin by projecting the PowerPoint onto your interactive whiteboard or display screen.
2. Introduce the concept of cross-sections using the definition and initial examples provided.
3. As you move through the slides, pause to discuss how slicing affects the shape and size of the resulting 2D surface.
4. Invite students to draw or predict what the cross-section might look like before revealing the answer.
5. Use real 3D models alongside the slides to reinforce understanding, and follow up with hands-on or sketch-based tasks.

Ideas for Classroom Use:

• 💡 Use during a geometry unit to introduce or review slicing of 3D shapes
• 💡 Pause at key slides to allow students to draw possible cross-sections
• 💡 Combine with hands-on slicing activities using clay or nets
• 💡 Encourage students to explain their reasoning using correct terminology
• 💡 Use in STEM tasks involving design or spatial planning

Top Teacher Tips:

• 💛 Print key slides as visual prompts for group discussions
• 💛 Use real-world objects to reinforce abstract ideas in a concrete way
• 💛 Pair students to discuss and compare their sketches and predictions
• 💛 Revisit the presentation throughout the unit as a reference tool

Cross-sections of 3D Objects POWERPOINT is a helpful and engaging way to guide students through the visualisation of 3D shapes and how they change when sliced - supporting spatial reasoning and rich mathematical discussions.

Check out our matching Cross-sections of 3D Objects Posters for additional classroom display and student support.