https://www.khanacademy.org/math/geometry-home/geometry-area-perimeter/geometry-area-trap-composite/v/area-of-a-trapezoid-1 2023-04-15T06:42:38.642148315Z Area of trapezoids Area of a trapezoid is found with the formula, A=(a+b)h/2. To find the area of a trapezoid, you need to know the lengths of the two parallel sides (the "bases") and the height. Add the lengths of the two bases together, and then multiply by the height. Finally, divide by 2 to get the area of the trapezoid. Sal Khan video https://cdn.kastatic.org/googleusercontent/2Qf_I9kn1tNDqsjFdl-9bjcHfFsPAwH-C-Wl-UTQIxVSY-8daxkrR9NlhBsu4tE4JgvWXA32HaInnk33giWNBfC6 Area of trapezoids Area of a trapezoid is found with the formula, A=(a+b)h/2. To find the area of a trapezoid, you need to know the lengths of the two parallel sides (the "bases") and the height. Add the lengths of the two bases together, and then multiply by the height. Finally, divide by 2 to get the area of the trapezoid. https://cdn.kastatic.org/ka-youtube-converted/j3-XYLnxJDY.mp4/j3-XYLnxJDY.mp4 288 Mensuration https://www.khanacademy.org/math/cc-sixth-grade-math/x0267d782:cc-6th-plane-figures/cc-6th-area/v/area-breaking-up-shape 2022-11-16T04:22:43.7414897Z Area of composite shapes We can sometimes calculate the area of a complex shape by dividing it into smaller, more manageable parts. In this example, we can determine the area of two triangles, a rectangle, and a trapezoid, and then add up the areas of the four shapes to get the total area. Sal Khan video https://cdn.kastatic.org/googleusercontent/yOLp742TUQZQUltkfNcy9ijXlddMEggpZACGkeyAjMydlk0PNASnOP7pFtrl2KSM8DwYMgvG2jCrFUEVUGViOS7x Area of composite shapes We can sometimes calculate the area of a complex shape by dividing it into smaller, more manageable parts. In this example, we can determine the area of two triangles, a rectangle, and a trapezoid, and then add up the areas of the four shapes to get the total area. https://cdn.kastatic.org/ka-youtube-converted/loAA3TCNAvU.mp4/loAA3TCNAvU.mp4 315 Mensuration 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 Mensuration https://www.khanacademy.org/math/grade-8-math-tx/x42e41b058fcf4059:measurement-of-three-dimensional-figures/x42e41b058fcf4059:surface-area-of-cylinders/v/surface-area-of-cylinders-formula 2024-04-15T13:20:13.302562643Z Surface area of cylinders formula Use previous knowledge of surface area to make connections to the formulas for lateral and total surface area of cylinders. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/482ec9ff-7908-4235-81f2-a5e3fdcced16_1280_720_base.png Surface area of cylinders formula Use previous knowledge of surface area to make connections to the formulas for lateral and total surface area of cylinders. https://cdn.kastatic.org/ka-youtube-converted/GOLJkXcrZ2c.mp4/GOLJkXcrZ2c.mp4 240 Mensuration https://www.khanacademy.org/math/cc-fifth-grade-math/5th-volume/imp-finding-volume/v/volume-of-a-rectangular-prism-or-box-examples 2022-11-16T04:22:43.7414897Z Volume of a rectangular prism If you want to know how much stuff you can cram into a box, finding its volume is key. To calculate the volume of a box, you need to know its height, width, and depth. You can find the volume by multiplying these three dimensions together. This formula works regardless of the units you are using (e.g. meters, feet), he method is the same - just make sure your units match up! Sal Khan video https://cdn.kastatic.org/googleusercontent/trl4HROL5F5JhCgGZyneiSc0I7-KAv7V6EEwtZlyAkchGk-QJPBYUbp1sScM0eQ803NUaaK8zcMyXcRrm8bDb5G1 Volume of a rectangular prism If you want to know how much stuff you can cram into a box, finding its volume is key. To calculate the volume of a box, you need to know its height, width, and depth. You can find the volume by multiplying these three dimensions together. This formula works regardless of the units you are using (e.g. meters, feet), he method is the same - just make sure your units match up! https://cdn.kastatic.org/ka-youtube-converted/I9efKVtLCf4.mp4/I9efKVtLCf4.mp4 119 Mensuration https://www.khanacademy.org/math/class-9-tg/x06d55bfa213a79fd:surface-areas-and-volumes/x06d55bfa213a79fd:volume-of-cuboid-cube-right-prism-and-pyramid/v/area-volume-of-solids-general-formula 2024-06-26T15:32:58.824704035Z Area & Volume of Solids, General formula In this video get to learn about the basic concept of volume and surface area of solids. How do we get the formulae for different 3D shapes? Learn more in this video. Devashish Phadnis video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Area & Volume of Solids, General formula In this video get to learn about the basic concept of volume and surface area of solids. How do we get the formulae for different 3D shapes? Learn more in this video. https://cdn.kastatic.org/ka-youtube-converted/JLZRr7FMvsk.mp4/JLZRr7FMvsk.mp4 283 Mensuration https://www.khanacademy.org/math/revision-ncert-class-8-math/x46f3ddd31448eca8:week-2/x46f3ddd31448eca8:mensuration/e/revision-mensuration-ncert-math-class-8 2026-04-08T00:16:02.937952483Z Revision Mensuration . Aakash Bagga exercise