https://www.khanacademy.org/math/geometry/hs-geo-solids/hs-geo-2d-vs-3d/a/solid-geometry-vocabulary 2023-04-03T02:28:37.893229479Z Solid geometry vocabulary Learn the names of common solid figures, the parts of those solids, and how we describe cross-sections of them. article https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-geometry-topic/x0267d782:cc-6th-nets-of-3d-figures/v/nets-of-polyhedra 2021-06-30T20:49:36Z Intro to nets of polyhedra Admittedly, "nets of polyhedra" sounds like the title of a bad sci-fi movie about man-eating, multi-headed fish. But in reality, nets of polyhedra are just 2D objects that wrap around 3D objects, like wrapping paper around presents. Sal Khan video https://cdn.kastatic.org/googleusercontent/Y37mID-JZzxDjs9nLIGVxHcULrvN-cPKP5AOM7ttIqnBJu8lHa-4qHJt_S0RYN7f2Pks_5Zm1JSVk6l4ZN6FILU Intro to nets of polyhedra Admittedly, "nets of polyhedra" sounds like the title of a bad sci-fi movie about man-eating, multi-headed fish. But in reality, nets of polyhedra are just 2D objects that wrap around 3D objects, like wrapping paper around presents. https://cdn.kastatic.org/ka-youtube-converted/ZACf9EecFrY.mp4/ZACf9EecFrY.mp4 408 Solids https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-geometry-topic/x0267d782:cc-6th-nets-of-3d-figures/e/nets-of-3d-figures 2026-02-20T07:10:30.803959564Z Nets of polyhedra Practice matching 2D nets to the 3D shapes the fold up into. Rhonda Hughes exercise https://www.khanacademy.org/math/geometry/hs-geo-solids/hs-geo-2d-vs-3d/e/slicing-3d-figures 2025-03-28T07:05:36.573142233Z Cross sections of 3D objects (basic) Match 3D objects with their 2D cross-sections. ivan.savov exercise https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-geometry-topic/geometric-solids/v/recognizing-common-3d-shapes 2023-09-15T04:55:18.07520004Z Recognizing common 3D shapes Learn about 3D shapes! A square pyramid has a square base. A rectangular prism is a box shape with all rectangular sides. A triangular prism has triangle faces on opposite sides. A sphere is like a globe. A cylinder looks like a can with circular faces on top and bottom. Shapes are fun! video https://cdn.kastatic.org/ka_thumbnails_cache/269d8dc9-c41f-45fa-9752-bac89194cc97_1280_720_base.png Recognizing common 3D shapes Learn about 3D shapes! A square pyramid has a square base. A rectangular prism is a box shape with all rectangular sides. A triangular prism has triangle faces on opposite sides. A sphere is like a globe. A cylinder looks like a can with circular faces on top and bottom. Shapes are fun! https://cdn.kastatic.org/ka-youtube-converted/tqxQSSzuXX0.mp4/tqxQSSzuXX0.mp4 209 Solids https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-geometry-topic/geometric-solids/e/identify-geometric-solids--3d-figures- 2025-04-16T14:25:03.578489663Z Identify geometric solids (3D shapes) Identify prisms, pyramids, cylinders, cones, and spheres. Lindsay exercise https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-geometry-topic/geometric-solids/v/counting-faces-and-edges-of-3d-shapes 2023-09-15T04:55:18.07520004Z Counting faces and edges of 3D shapes Learn about shapes! Discover how to count faces and edges on 3D figures. We explore a transparent shape with five faces and another shape, a square pyramid, with eight edges and five faces. It's a colorful journey into geometry! video https://cdn.kastatic.org/ka_thumbnails_cache/77a3d873-7311-4e5d-a95a-b315abb25791_1280_720_base.png Counting faces and edges of 3D shapes Learn about shapes! Discover how to count faces and edges on 3D figures. We explore a transparent shape with five faces and another shape, a square pyramid, with eight edges and five faces. It's a colorful journey into geometry! https://cdn.kastatic.org/ka-youtube-converted/_y17uHBwa_8.mp4/_y17uHBwa_8.mp4 227 Solids https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-geometry-topic/geometric-solids/e/identify-parts-of-3d-shapes 2025-05-22T15:16:12.691169048Z Identify parts of 3D shapes Identify faces, bases, edges, and vertices on 3D shapes. Lindsay exercise