https://www.khanacademy.org/math/cc-fourth-grade-math/area-perimeter/imp-area-and-perimeter/v/length-and-width-from-perimeter-and-area 2021-06-30T20:49:36Z Area & perimeter word problem: table Sal solves for the dimension of a table. Sal Khan video https://cdn.kastatic.org/googleusercontent/bUWwgdmepYyUJPXGd5_FtUnPDqyK1jQB6JH5S3tR9HVI7o57ugNPYTI2gG2Adq6l8a5vyF2RcTPhHka_t7bcppvh Area & perimeter word problem: table Sal solves for the dimension of a table. https://cdn.kastatic.org/ka-youtube-converted/-J-6VGxld54.mp4/-J-6VGxld54.mp4 286 Area and perimeter of polygons https://www.khanacademy.org/math/cc-fourth-grade-math/area-perimeter/imp-area-and-perimeter/e/area-and-perimeter-of-rectangles-word-problems 2026-04-07T23:17:37.123726494Z Area & perimeter of rectangles word problems Find the missing side length of a rectangle when given its perimeter or area.  Compare perimeters and areas of rectangles. Lori Hodges exercise https://www.khanacademy.org/math/cc-fourth-grade-math/area-perimeter/imp-area-and-perimeter/v/width-from-perimeter 2021-07-02T09:35:28Z Area & perimeter word problem: dog pen Sal figures out the width of a dog pen. Sal Khan video https://cdn.kastatic.org/googleusercontent/ZN2gMk2z36sJJfWEvYHh3xLCn-uLmo8LSN6ntEcxOpmnvmt0ricgJ-WLQjk3TPpF4Q2tzhgbP2JtJLHPiih121Y Area & perimeter word problem: dog pen Sal figures out the width of a dog pen. https://cdn.kastatic.org/ka-youtube-converted/AIb5x7fmtvE.mp4/AIb5x7fmtvE.mp4 194 Area and perimeter of polygons https://www.khanacademy.org/math/cc-third-grade-math/3rd-perimeter/imp-comparing-area-and-perimeter/a/perimeter-faq 2022-10-26T00:35:16.433489642Z Perimeter: FAQ Frequently asked questions about finding the perimeter of shapes. article https://www.khanacademy.org/math/cc-third-grade-math/3rd-perimeter/imp-comparing-area-and-perimeter/e/area-and-perimeter-scenarios 2023-07-21T15:44:30.100514261Z Area and perimeter situations Determine if a situation represents area or perimeter. Lindsay exercise https://www.khanacademy.org/math/cc-fourth-grade-math/area-perimeter/imp-area-and-perimeter/v/comparing-area 2021-07-02T09:35:29Z Comparing areas word problem Sal compares the area of two posters using their side-lengths. Sal Khan video https://cdn.kastatic.org/googleusercontent/1J2BDbHdmSQAxMImhW74FsJMP2VcUmd90zKbIGF4Kp0SGkJjqzd1V3zuAX9-Z42cbUrP4kXZN94b5Y5XasF0arOs Comparing areas word problem Sal compares the area of two posters using their side-lengths. https://cdn.kastatic.org/ka-youtube-converted/D2Ks5SKU6GM.mp4/D2Ks5SKU6GM.mp4 141 Area and perimeter of polygons https://www.khanacademy.org/math/cc-third-grade-math/3rd-perimeter/imp-comparing-area-and-perimeter/e/comparing-area-and-perimeter 2021-06-30T20:49:36Z Compare area and perimeter Compare the areas and perimeters of rectangles when given a context or picture. elizabeth exercise https://www.khanacademy.org/math/cc-sixth-grade-math/x0267d782:cc-6th-plane-figures/cc-6th-parallelogram-area/v/intuition-for-area-of-a-parallelogram 2023-06-30T00:54:25.287354524Z Area of a parallelogram Discover the magic of geometry! The area of a rectangle and a parallelogram can be calculated in the same way. Just multiply the base by the height! This simple trick works because a parallelogram can be rearranged into a rectangle. Geometry is full of surprises! video https://cdn.kastatic.org/googleusercontent/obiKP_sTiYrTr2fcbjLKQd_D2WPPutmNxH_iXMfLCXGMXZfuweYw8KyoZdldr2mQFrC5n9vLBH0H_xSehXBS4vEV Area of a parallelogram Discover the magic of geometry! The area of a rectangle and a parallelogram can be calculated in the same way. Just multiply the base by the height! This simple trick works because a parallelogram can be rearranged into a rectangle. Geometry is full of surprises! https://cdn.kastatic.org/ka-youtube-converted/hm17lVaor0Q.mp4/hm17lVaor0Q.mp4 177 Area and perimeter of polygons https://www.khanacademy.org/math/cc-sixth-grade-math/x0267d782:cc-6th-plane-figures/cc-6th-parallelogram-area/a/area-of-parallelogram 2023-12-11T22:10:22.66384181Z Area of parallelograms Understand how to find the area of a parallelogram and why it works. article https://www.khanacademy.org/math/up-class-9-bridge/x27a9f6658c8b5c27:quadrilaterals/x27a9f6658c8b5c27:untitled-24/e/b8-area-of-parallelogram 2026-04-07T22:59:30.107127435Z Area of parallelogram Area of parallelogram ashish exercise https://www.khanacademy.org/math/cc-sixth-grade-math/x0267d782:cc-6th-plane-figures/cc-6th-parallelogram-area/e/find-missing-side-when-given-area-of-a-parallelogram 2025-02-07T09:32:27.480992556Z Find missing length when given area of a parallelogram Find the base or height of a parallelogram when given the other and the area. Lindsay exercise https://www.khanacademy.org/math/cc-sixth-grade-math/x0267d782:cc-6th-plane-figures/cc-6th-parallelogram-area/v/finding-height-of-a-parallelogram 2023-06-30T00:54:25.287354524Z Finding height of a parallelogram In this lesson, we learned that the area of a parallelogram equals the base times the height. Given an area of 24 units and a base of 6 units, we used this formula to find the missing height. The answer was 4 units. Isn't math fun? video https://cdn.kastatic.org/ka_thumbnails_cache/c702545c-0bbc-4ce1-9d2f-0c23c5a17d52_1280_720_base.png Finding height of a parallelogram In this lesson, we learned that the area of a parallelogram equals the base times the height. Given an area of 24 units and a base of 6 units, we used this formula to find the missing height. The answer was 4 units. Isn't math fun? https://cdn.kastatic.org/ka-youtube-converted/SKe3ItfdzTY.mp4/SKe3ItfdzTY.mp4 102 Area and perimeter of polygons https://www.khanacademy.org/math/cc-sixth-grade-math/x0267d782:cc-6th-plane-figures/cc-6th-area-triangle/v/intuition-for-area-of-a-triangle 2023-06-30T00:54:25.287354524Z Area of a triangle The area of a rectangle and a parallelogram is found by multiplying the base by the height. For a triangle, the area is half of a parallelogram's, so it's calculated by multiplying the base by the height and then dividing by 2. video https://cdn.kastatic.org/googleusercontent/Fi9pR66SMMyijKzoyFIw6a2cHjUub-HncPLAlfT0a90llRBEciMFgGmv-CAlSSHoRNi9iIgUuqiBYzHBnwv9yt4 Area of a triangle The area of a rectangle and a parallelogram is found by multiplying the base by the height. For a triangle, the area is half of a parallelogram's, so it's calculated by multiplying the base by the height and then dividing by 2. https://cdn.kastatic.org/ka-youtube-converted/rRTXKQpblEc.mp4/rRTXKQpblEc.mp4 330 Area and perimeter of polygons https://www.khanacademy.org/math/cc-sixth-grade-math/x0267d782:cc-6th-plane-figures/cc-6th-area-triangle/e/area_of_triangles_1 2026-03-24T23:41:07.080866137Z Area of triangles Practice finding the area of right, acute, and obtuse triangles. Chanda Stanaland Johnson exercise https://www.khanacademy.org/math/cc-sixth-grade-math/x0267d782:cc-6th-plane-figures/cc-6th-area-triangle/a/area-of-triangle 2021-06-30T20:49:25Z Area of triangles Intuition for why the area of a triangle is one half of base times height.  article https://www.khanacademy.org/math/cc-sixth-grade-math/x0267d782:cc-6th-plane-figures/cc-6th-area-triangle/v/example-finding-area-of-triangle 2023-06-30T00:54:25.287354524Z Finding area of triangles The area of a triangle is found by multiplying one half of the base by the height. In our example, the base is 18 and the height is 6. So, half of 18 is 9, and 9 times 6 equals 54 square units. video https://cdn.kastatic.org/ka_thumbnails_cache/37c62636-15f6-4d9d-90c1-44bfdef4fbea_1280_720_base.png Finding area of triangles The area of a triangle is found by multiplying one half of the base by the height. In our example, the base is 18 and the height is 6. So, half of 18 is 9, and 9 times 6 equals 54 square units. https://cdn.kastatic.org/ka-youtube-converted/7N5orPxUoGo.mp4/7N5orPxUoGo.mp4 91 Area and perimeter of polygons https://www.khanacademy.org/math/cc-sixth-grade-math/x0267d782:cc-6th-plane-figures/cc-6th-area-triangle/e/find-base-and-height-on-a-triangle 2026-04-08T01:19:59.083532605Z Find base and height on a triangle Identify the height of a triangle as the segment perpendicular to the base and reaching the other vertex. Lindsay exercise 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 Area and perimeter of polygons https://www.khanacademy.org/math/geometry-home/geometry-area-perimeter/geometry-area-trap-composite/e/areas_of_trapezoids_rhombi_and_kites 2026-03-24T23:41:07.080866137Z Area of trapezoids Practice finding the areas of trapezoids. Omar Rizwan exercise https://www.khanacademy.org/math/cc-third-grade-math/3rd-perimeter/imp-perimeter/v/introduction-to-perimeter 2023-04-19T11:35:31.910148755Z Perimeter: introduction Perimeter is a math concept that measures the total length around the outside of a shape. To find the perimeter, you add together the lengths of all the sides. This works for any shape, including triangles, rectangles, pentagons, and even irregular polygons. Sal Khan video https://cdn.kastatic.org/googleusercontent/aTvq7f3uGIpqeoqnKTdxUkoGyVejTcBvBXqaj7wzF4xDy1JAs8xn1oz1vrTQbSsF6zh-V3eQkAXzKg0hNkdL7sqR Perimeter: introduction Perimeter is a math concept that measures the total length around the outside of a shape. To find the perimeter, you add together the lengths of all the sides. This works for any shape, including triangles, rectangles, pentagons, and even irregular polygons. https://cdn.kastatic.org/ka-youtube-converted/9uwLgf84p5w.mp4/9uwLgf84p5w.mp4 201 Area and perimeter of polygons https://www.khanacademy.org/math/cc-third-grade-math/3rd-perimeter/imp-perimeter/a/perimeter-review 2021-06-30T20:49:27Z Perimeter review Review the basics of perimeter and try some practice problems. article https://www.khanacademy.org/math/cc-third-grade-math/3rd-perimeter/perimeter-of-polygons-with-missing-side-lengths/e/find-a-missing-side-length-when-given-perimeter 2025-06-24T14:43:14.98588327Z Find a missing side length when given perimeter Find a missing side length for a figure when given the perimeter. Lindsay exercise https://www.khanacademy.org/math/cc-third-grade-math/3rd-perimeter/imp-perimeter-word-problems/v/perimeter-word-problem-skating-rink-math-3rd-grade-khan-academy 2021-06-30T20:49:26Z Perimeter word problem: skating rink Solve a word problem involving perimeter of a rectangle. Lindsay Spears video https://cdn.kastatic.org/googleusercontent/2ZPp0Kt49vn7DIZ1EBOubhtm7IZgXStzxbyucM1L1eoVawVHAVZmsYuBlD9XyNXmpMG23C9SCeWupH1rLm6njuw Perimeter word problem: skating rink Solve a word problem involving perimeter of a rectangle. https://cdn.kastatic.org/ka-youtube-converted/dNBNepJ_Ut8.mp4/dNBNepJ_Ut8.mp4 148 Area and perimeter of polygons https://www.khanacademy.org/math/cc-third-grade-math/3rd-perimeter/imp-perimeter-word-problems/e/perimeter-word-problems 2026-04-08T00:16:02.937952483Z Perimeter word problems Practice solving real world word problems involving perimeter. Lindsay exercise