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 of Solids 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 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/finding-surface-area-using-net 2022-11-16T04:22:43.7414897Z Surface area using a net: triangular prism Here are the steps to compute the surface area of a triangular prism: 1. Find the areas of each of the three rectangular faces, using the formula for the area of a rectangle: length x width. 2. Next, find the area of the two triangular faces, using the formula for the area of a triangle: 1/2 base x height. 3. Add the areas of all five faces together, and you're done! video https://cdn.kastatic.org/googleusercontent/OfzYz0f4VOC7gQTFba9xbZgDzBPf9R5DQMzRZahvQ67bcRMTDOaupWxFYP4y2CvBZBAM1CrVL0rhHpks0YOcO0PD Surface area using a net: triangular prism Here are the steps to compute the surface area of a triangular prism: 1. Find the areas of each of the three rectangular faces, using the formula for the area of a rectangle: length x width. 2. Next, find the area of the two triangular faces, using the formula for the area of a triangle: 1/2 base x height. 3. Add the areas of all five faces together, and you're done! https://cdn.kastatic.org/ka-youtube-converted/mtMNvnm71Z0.mp4/mtMNvnm71Z0.mp4 214 Surface area of Solids 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/geometry/hs-geo-solids/hs-geo-solids-intro/v/cylinder-volume-and-surface-area 2021-06-30T20:49:30Z Cylinder volume & surface area A cylinder's volume is π r² h, and its surface area is 2π r h + 2π r². Learn how to use these formulas to solve an example problem. Sal Khan video https://cdn.kastatic.org/googleusercontent/GjYxIovSc5D2Ir4ecuSc8TZ_VJyKkbvFsnpJvSLJNE5O_zjx0qf2mxk0GQY5kyZXSoVsuxn9KI77OninYqzMR3m6 Cylinder volume & surface area A cylinder's volume is π r² h, and its surface area is 2π r h + 2π r². Learn how to use these formulas to solve an example problem. https://cdn.kastatic.org/ka-youtube-converted/gL3HxBQyeg0.mp4/gL3HxBQyeg0.mp4 487 Surface area of Solids https://www.khanacademy.org/math/geometry/hs-geo-solids/hs-geo-solids-intro/e/solid_geometry 2025-01-17T13:12:19.09935971Z Volume and surface area of cylinders Find volumes and surface areas of cylinders. Ben Alpert exercise https://www.khanacademy.org/math/cambridge-o-level-mathematics-4024/x3f4c73d082a798eb:mensuration/x3f4c73d082a798eb:surface-area-of-solids/v/surface-area-of-sphere-computation-sense-of-formula 2026-03-10T04:30:37.966653692Z Surface area of sphere computation & sense of formula Created by Khan Academy Khan Academy Pakistan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Surface area of sphere computation & sense of formula Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/klXf-VlAqZE.mp4/klXf-VlAqZE.mp4 270 Surface area of Solids https://www.khanacademy.org/math/cambridge-o-level-mathematics-4024/x3f4c73d082a798eb:mensuration/x3f4c73d082a798eb:surface-area-of-solids/v/surface-area-of-a-rectangular-pyramid 2025-06-09T15:36:58.137149685Z Surface area of a rectangular pyramid Given a right rectangular (non-square) pyramid with the dimensions of the base and the height of the pyramid, let's find the lateral and total surface area. We'll use the Pythagorean theorem to find the slant heights of the lateral faces. Sal Khan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Surface area of a rectangular pyramid Given a right rectangular (non-square) pyramid with the dimensions of the base and the height of the pyramid, let's find the lateral and total surface area. We'll use the Pythagorean theorem to find the slant heights of the lateral faces. https://cdn.kastatic.org/ka-youtube-converted/zNL3W-rXbY0.mp4/zNL3W-rXbY0.mp4 338 Surface area of Solids https://www.khanacademy.org/math/cambridge-o-level-mathematics-4024/x3f4c73d082a798eb:mensuration/x3f4c73d082a798eb:surface-area-of-solids/v/surface-area-of-an-octagonal-pyramid 2025-06-09T15:36:58.137149685Z Surface area of an octagonal pyramid Given a right pyramid with a regular octagon as the base, let's find the lateral and total surface area. Since the base is a regular octagon, we can use trigonometric ratios to help find the areas of the base and the lateral faces. Sal Khan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Surface area of an octagonal pyramid Given a right pyramid with a regular octagon as the base, let's find the lateral and total surface area. Since the base is a regular octagon, we can use trigonometric ratios to help find the areas of the base and the lateral faces. https://cdn.kastatic.org/ka-youtube-converted/Pfoy2IW7oHw.mp4/Pfoy2IW7oHw.mp4 442 Surface area of Solids https://www.khanacademy.org/math/cambridge-o-level-mathematics-4024/x3f4c73d082a798eb:mensuration/x3f4c73d082a798eb:surface-area-of-solids/v/calculating-surface-area-of-a-cone 2026-03-10T04:30:37.966653692Z Calculating surface area of a cone Created by Khan Academy Khan Academy Pakistan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Calculating surface area of a cone Created by Khan Academy https://cdn.kastatic.org/ka-youtube-converted/mrewck-WEcQ.mp4/mrewck-WEcQ.mp4 305 Surface area of Solids https://www.khanacademy.org/math/strengthened-shs-general-math/x24dc5a0902f75de5:patterns-arithmetic-and-geometric-sequence-and-series/x24dc5a0902f75de5:surface-area/v/surface-area-of-a-cone 2025-06-09T15:36:58.137149685Z Surface area of a cone To find the surface area of a right circular cone, we can draw its net, which looks like a circle and a sector. Let's build intuition for where the general formulas for lateral surface area and total surface area of a cone come from, then apply them to a specific cone. Sal Khan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Surface area of a cone To find the surface area of a right circular cone, we can draw its net, which looks like a circle and a sector. Let's build intuition for where the general formulas for lateral surface area and total surface area of a cone come from, then apply them to a specific cone. https://cdn.kastatic.org/ka-youtube-converted/9w6qYXatwkM.mp4/9w6qYXatwkM.mp4 376 Surface area of Solids https://www.khanacademy.org/math/class-9-tg/x06d55bfa213a79fd:surface-areas-and-volumes/x06d55bfa213a79fd:right-circular-cone/e/mensuration-18-e 2025-10-28T17:00:48.896066765Z Surface area of a cone Mensuration ashish exercise https://www.khanacademy.org/math/cambridge-o-level-mathematics-4024/x3f4c73d082a798eb:mensuration/x3f4c73d082a798eb:surface-area-of-solids/e/lateral-total-surface-area-of-prisms-pyramids-cones-and-spheres 2025-07-14T17:52:37.554692358Z Lateral & total surface area of prisms, pyramids, cones, and spheres Find the lateral and total surface area of prisms, pyramids, cones, and spheres, including figures with regular polygon bases. Charlie Auen exercise