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 Surface Area 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/science/ap-biology/cell-structure-and-function/cell-size/v/surface-area-of-a-box 2022-11-16T04:22:43.7414897Z Surface area of a box (cuboid) Surface area is total area on the surface of a three-dimensional shape. To find the surface area of a cuboid which has 6 rectangular faces, add the areas of all 6 faces. Or, you can label the length (l), width (w), and height (h) of the cuboid and use the formula: surface area (SA)=2lw+2lh+2hw. video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Surface area of a box (cuboid) Surface area is total area on the surface of a three-dimensional shape. To find the surface area of a cuboid which has 6 rectangular faces, add the areas of all 6 faces. Or, you can label the length (l), width (w), and height (h) of the cuboid and use the formula: surface area (SA)=2lw+2lh+2hw. https://cdn.kastatic.org/ka-youtube-converted/1iSBNSYhvIU.mp4/1iSBNSYhvIU.mp4 145 Surface Area https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-geometry-topic/x0267d782:cc-6th-nets-of-3d-figures/v/surface-area-of-a-box-using-nets 2023-09-21T21:49:35.177342261Z Surface area of a box using nets Discover the surface area of a cereal box by visualizing a net. Cut and flatten the box to create a 2D shape. Measure the dimensions, calculate the area of each section, and add them up for the total surface area. Fun and practical! video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Surface area of a box using nets Discover the surface area of a cereal box by visualizing a net. Cut and flatten the box to create a 2D shape. Measure the dimensions, calculate the area of each section, and add them up for the total surface area. Fun and practical! https://cdn.kastatic.org/ka-youtube-converted/vl1uMOYFyf4.mp4/vl1uMOYFyf4.mp4 284 Surface Area https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-geometry-topic/x0267d782:cc-6th-nets-of-3d-figures/e/surface-area 2026-04-07T23:55:07.30621384Z Surface area using nets Practice using the net of a 3D figure to find surface area. Matthew Evans exercise https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-geometry-topic/cc-6th-surface-area/e/surface-areas 2026-03-10T04:30:37.966653692Z Surface area Practice finding the surface area of 3D objects. Rhonda Hughes exercise https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-geometry-topic/x0267d782:cc-6th-nets-of-3d-figures/v/surface-area-from-net 2021-06-30T20:49:33Z Surface area using a net: rectangular prism A polyhedron is a three-dimensional shape that has flat surfaces and straight edges.  Learn whether or not a certain net could be folded up into a certain rectangular prism. Sal Khan video https://cdn.kastatic.org/googleusercontent/Hl02dFXar1r1dZF3DWyCFfVpHs57HDWZq1AjmVj--nLeZSzmz8xR2oq09l5SgJqt-DpOhWlB8jFgsU8JxVEhPQ9z Surface area using a net: rectangular prism A polyhedron is a three-dimensional shape that has flat surfaces and straight edges.  Learn whether or not a certain net could be folded up into a certain rectangular prism. https://cdn.kastatic.org/ka-youtube-converted/m1ZTnl4CNQg.mp4/m1ZTnl4CNQg.mp4 259 Surface Area https://www.khanacademy.org/math/cc-sixth-grade-math/cc-6th-geometry-topic/cc-6th-surface-area/a/surface-area-review 2026-03-31T08:44:48.259988263Z Surface area review Review surface area and try some practice problems. article