--- title: "Edges, vertices, and faces" description: "Identify and describe properties of 3-D shapes including the number of edges, vertices, and faces" canonical: https://lightmysky.com/learn/mathematics/edges-vertices-and-faces-mt_Mnodea7mG_ source: https://lightmysky.com/learn/mathematics/edges-vertices-and-faces-mt_Mnodea7mG_.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`. # Edges, vertices, and faces Identify and describe properties of 3-D shapes including the number of edges, vertices, and faces Subject: Mathematics · Area: Geometry · Ages 6 to 7 Page: https://lightmysky.com/learn/mathematics/edges-vertices-and-faces-mt_Mnodea7mG_ ## Ready when they can - Count the edges, vertices, and faces of common 3-D shapes - Use the terms edge, vertex (vertices), and face correctly - Describe a 3-D shape by its properties (e.g. a cube has 6 faces, 12 edges, 8 vertices) ## Lesson: Faces, Edges, and Vertices A 3-D shape like a cube has three special parts. A face is a flat side you can touch, like the front of a book. An edge is the straight line where two faces meet. A vertex is the sharp point where edges meet. When there is more than one, we call them vertices. **Example.** Look at a cube, like a dice. It has 6 flat faces, and every face is a square. It has 12 edges where the faces meet. It has 8 vertices, the sharp corners. *(drawing: This square is one face of a cube. A cube has 6 faces just like it, and the sides of each square are the cube's edges.)* **Tip.** When you count edges or vertices on a shape, touch each one only once. If you touch the same corner twice, your count will be wrong. **Example.** A triangular prism looks like a tent. It has 2 triangle faces and 3 rectangle faces, so 5 faces in all. It has 9 edges and 6 vertices. **Recap.** Faces are flat, edges are the lines where faces meet, and vertices are the corners. Count each part just once. ## Practice 18 questions on this page, each with its working shown. ## Needs first - [3-D shapes](https://lightmysky.com/learn/mathematics/3-d-shapes-mt_Qcp2d_kuta) - [Comparing 2-D and 3-D shapes](https://lightmysky.com/learn/mathematics/comparing-2-d-and-3-d-shapes-mt_yGv8doDAmp) ## Opens up - [Sorting 2-D and 3-D shapes](https://lightmysky.com/learn/mathematics/sorting-2-d-and-3-d-shapes-mt_fEuoBYw6bU) - [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) - [Drawing shapes with given attributes](https://lightmysky.com/learn/mathematics/drawing-shapes-with-given-attributes-mt_zuOGOGFAKb)