--- title: "3-D shapes (age 9+)" description: "Identify 3-D shapes, including cubes and other cuboids, from 2-D representations" canonical: https://lightmysky.com/learn/mathematics/3-d-shapes-age-9-mt_wUSbRt3-qw source: https://lightmysky.com/learn/mathematics/3-d-shapes-age-9-mt_wUSbRt3-qw.md retrieved: 2026-10-19 --- > **Agent view.** This is the Markdown twin of the page, for tools and assistants. > When to use this site, and the call that answers each job: https://lightmysky.com/agent-instructions.md > API description (OpenAPI 3.1): https://lightmysky.com/openapi.json · Authentication: https://lightmysky.com/auth.md > Pricing: https://lightmysky.com/pricing.md · Catalog: https://lightmysky.com/llms.txt · Full catalog: https://lightmysky.com/llms-full.txt > Every machine-readable file on this domain: https://lightmysky.com/.well-known/ai-catalog.json > Ask for Markdown with `Accept: text/markdown`, a `.md` address, or `?mode=agent`. # 3-D shapes (age 9+) Identify 3-D shapes, including cubes and other cuboids, from 2-D representations Subject: Mathematics · Area: Geometry · Ages 9 to 10 Page: https://lightmysky.com/learn/mathematics/3-d-shapes-age-9-mt_wUSbRt3-qw ## Ready when they can - Identify a cuboid from its net - Name the 3-D shape shown in an isometric drawing - Match 2-D representations to the correct 3-D shape ## Lesson: Naming 3-D shapes from flat pictures You already know how a net folds up into a solid shape. Now flip that idea around: look at a flat picture and name the 3-D shape it stands for. A cuboid net is six rectangles joined the right way, like the faces of a box. Each flat piece becomes one face. If all six are same-size squares, that box is a special cuboid called a cube. **Example.** Priya looks at a net with one square and four triangles attached to its sides. The triangles meet at a point when folded, so Priya knows this net makes a pyramid, not a cuboid. An isometric drawing uses slanted lines so a flat picture looks solid, like you are looking at the corner of a real box. Count the flat faces and check the corners to name the shape. A box with six rectangle faces is a cuboid. *(drawing: Every flat picture is a clue. Count the faces, check the corners, and the 3-D shape names itself.)* A cube has every edge the same length, like a dice. A cuboid can have edges of different lengths, like a shoebox. A pyramid has triangle faces meeting at one point above a flat base. In an isometric drawing, a cube shows equal edges, but a cuboid that is not a cube shows uneven edges. **Recap.** A flat picture, like a net or an isometric drawing, is a clue that names the 3-D shape hiding inside it. ## Practice 18 questions on this page, each with its working shown. ## Needs first - [Drawing 2-D shapes and making 3-D shapes](https://lightmysky.com/learn/mathematics/drawing-2-d-shapes-and-making-3-d-shapes-mt_vJUa62bxeR) - [Nets of 3-D Shapes](https://lightmysky.com/learn/mathematics/nets-of-3-d-shapes-mt_vnJEztczji) ## Opens up - [Rock layers and Earth's history](https://lightmysky.com/learn/science/rock-layers-and-earths-history-mt_0_K-GrKQpd) - [3-D shapes (age 11+)](https://lightmysky.com/learn/mathematics/3-d-shapes-age-11-mt_nRksLqt-iR) - [3-D shapes (age 10+)](https://lightmysky.com/learn/mathematics/3-d-shapes-age-10-mt_REwgr0d_ss)