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/imp-perimeter/e/perimeter-2 2025-02-10T05:04:39.155459793Z Find perimeter when given side lengths Find perimeter of figures when given an image or context.   Lindsay Spears exercise https://www.khanacademy.org/math/class-6-ncf/x04ca845a9a148c80:perimeter-and-area/x04ca845a9a148c80:perimeter-of-polygons-with-missing-side-lengths/v/finding-perimeter-when-a-side-length-is-missing-indian-accent 2025-06-08T17:08:59.076161332Z Finding perimeter when a side length is missing The video is teaching us how to find the perimeter of a shape. To do this, we need to measure the lengths of all the sides and add them together. Sometimes we have to use clues to figure out the length of a side if it isn't labeled. The perimeter is the total distance around the outside of the shape. Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Finding perimeter when a side length is missing The video is teaching us how to find the perimeter of a shape. To do this, we need to measure the lengths of all the sides and add them together. Sometimes we have to use clues to figure out the length of a side if it isn't labeled. The perimeter is the total distance around the outside of the shape. https://cdn.kastatic.org/ka-youtube-converted/V3557O0CVFs.mp4/V3557O0CVFs.mp4 157 Perimeter and Area https://www.khanacademy.org/math/cc-third-grade-math/3rd-perimeter/perimeter-of-polygons-with-missing-side-lengths/e/find-perimeter-when-a-side-length-is-missing 2026-04-30T18:30:41.846286703Z Find perimeter when a side length is missing Find perimeter of polygons when not all side lengths are labeled. Lindsay exercise https://www.khanacademy.org/math/class-6-ncf/x04ca845a9a148c80:perimeter-and-area/x04ca845a9a148c80:perimeter-of-polygons-with-missing-side-lengths/v/finding-missing-side-length-when-given-perimeter-indian-accent 2025-05-30T05:30:36.604331212Z Finding missing side length when given perimeter The video illustrates how to find the lengths of unknown sides on a shape by using the given perimeter and the lengths of known sides. Two examples are given, and in each case, the missing side lengths are determined to be 5 units. Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Finding missing side length when given perimeter The video illustrates how to find the lengths of unknown sides on a shape by using the given perimeter and the lengths of known sides. Two examples are given, and in each case, the missing side lengths are determined to be 5 units. https://cdn.kastatic.org/ka-youtube-converted/XEzrHkqp91A.mp4/XEzrHkqp91A.mp4 237 Perimeter and Area 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/class-6-ncf/x04ca845a9a148c80:perimeter-and-area/x04ca845a9a148c80:perimeter-word-problems/v/perimeter-word-problem-tables-indian-accent 2025-06-08T17:08:59.076161332Z Perimeter word problem: tables Lindsay solves a perimeter word problem that involves combining two perimeters. Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Perimeter word problem: tables Lindsay solves a perimeter word problem that involves combining two perimeters. https://cdn.kastatic.org/ka-youtube-converted/Uw8NwSH48-Y.mp4/Uw8NwSH48-Y.mp4 191 Perimeter and Area 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 Perimeter and Area 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 https://www.khanacademy.org/math/class-6-ncf/x04ca845a9a148c80:perimeter-and-area/x04ca845a9a148c80:area-formula/v/counting-unit-squares-to-find-area-formula-indian-accent 2025-05-30T05:30:36.604331212Z Counting unit squares to find area formula Sal uses unit squares to see why multiplying side-lengths can also find the area of rectangles.    Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Counting unit squares to find area formula Sal uses unit squares to see why multiplying side-lengths can also find the area of rectangles.    https://cdn.kastatic.org/ka-youtube-converted/bTX-ZAH9AEo.mp4/bTX-ZAH9AEo.mp4 272 Perimeter and Area https://www.khanacademy.org/math/class-6-ncf/x04ca845a9a148c80:perimeter-and-area/x04ca845a9a148c80:area-formula/v/transitioning-from-unit-squares-to-area-formula-indian-accent 2025-06-08T17:08:59.076161332Z Transitioning from unit squares to area formula Lindsay finds the area of a rectangle both by counting unit squares and multiplying side lengths.  Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Transitioning from unit squares to area formula Lindsay finds the area of a rectangle both by counting unit squares and multiplying side lengths.  https://cdn.kastatic.org/ka-youtube-converted/K_at0Pg7eBk.mp4/K_at0Pg7eBk.mp4 156 Perimeter and Area https://www.khanacademy.org/math/cc-third-grade-math/imp-geometry/imp-area-formula-intuition/e/area-of-rectangles-with-partial-arrays 2023-08-29T14:12:56.454303975Z Area of rectangles with partial arrays Find the area of rectangles when not all square units are shown. Lindsay exercise https://www.khanacademy.org/math/cc-third-grade-math/imp-geometry/imp-area-formula-intuition/e/finding-area-by-multiplying 2026-04-24T10:30:39.970882433Z Transition from unit squares to area formula Find area of rectangles by multiplying side-lengths. Lindsay Spears exercise https://www.khanacademy.org/math/cc-third-grade-math/imp-geometry/imp-multiply-to-find-area/e/area-of-squares-and-rectangles 2026-06-18T15:40:05.331792771Z Area of rectangles Find area of rectangles and squares by multiplying side lengths. Lindsay exercise https://www.khanacademy.org/math/class-6-ncf/x04ca845a9a148c80:perimeter-and-area/x04ca845a9a148c80:area-formula/v/finding-missing-side-when-given-area-indian-accent 2025-06-05T07:09:47.125536708Z Finding missing side when given area Lindsay finds the missing side length on a rectangle when given the area of the rectangle.  Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! (add course link here) Khan Academy India is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We have videos and exercises that have been translated into multiple Indian languages, and 15 million people around the globe learn on Khan Academy every month. Support Us: https://india.khanacademy.org/donate Created by Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Finding missing side when given area Lindsay finds the missing side length on a rectangle when given the area of the rectangle.  Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! (add course link here) Khan Academy India is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. We have videos and exercises that have been translated into multiple Indian languages, and 15 million people around the globe learn on Khan Academy every month. Support Us: https://india.khanacademy.org/donate Created by https://cdn.kastatic.org/ka-youtube-converted/DDQgtGN0Lb8.mp4/DDQgtGN0Lb8.mp4 142 Perimeter and Area https://www.khanacademy.org/math/cc-third-grade-math/imp-geometry/imp-multiply-to-find-area/e/find-a-missing-side-length-when-given-area-of-a-rectangle 2024-09-14T11:44:41.070959017Z Find a missing side length when given area Practice finding a missing side length on a rectangle when given the other side length and the area. Lindsay exercise https://www.khanacademy.org/math/class-6-ncf/x04ca845a9a148c80:perimeter-and-area/x04ca845a9a148c80:area-word-problems/v/area-word-problem-house-size-indian-accent 2025-05-30T05:30:36.604331212Z Area word problem: house size Sal decomposes an irregular shape to find area of entire figure. Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Area word problem: house size Sal decomposes an irregular shape to find area of entire figure. https://cdn.kastatic.org/ka-youtube-converted/_pM9eP0gIU0.mp4/_pM9eP0gIU0.mp4 344 Perimeter and Area https://www.khanacademy.org/math/class-6-ncf/x04ca845a9a148c80:perimeter-and-area/x04ca845a9a148c80:area-word-problems/e/area-world-problems 2026-04-07T23:17:37.123726494Z Area word problems Let's solve a few real-world problems involving areas of rectangles. Aanand exercise https://www.khanacademy.org/math/class-6-ncf/x04ca845a9a148c80:perimeter-and-area/x04ca845a9a148c80:decompose-figures-to-find-area/v/decomposing-shapes-to-find-area-grids-indian-accent 2025-06-08T17:08:59.076161332Z Decomposing shapes to find area: grids Lindsay finds the area of an irregular shape by decomposing it into 2 rectangles.  Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Decomposing shapes to find area: grids Lindsay finds the area of an irregular shape by decomposing it into 2 rectangles.  https://cdn.kastatic.org/ka-youtube-converted/71oQJINXPRQ.mp4/71oQJINXPRQ.mp4 128 Perimeter and Area https://www.khanacademy.org/math/cc-third-grade-math/imp-geometry/imp-decompose-figures-to-find-area/e/decompose-figures-to-find-area-1 2026-04-08T00:16:02.937952483Z Understand decomposing figures to find area Practice decomposing figures into rectangles to find area. Some figures are on grids. Lindsay exercise https://www.khanacademy.org/math/class-6-ncf/x04ca845a9a148c80:perimeter-and-area/x04ca845a9a148c80:decompose-figures-to-find-area/v/decomposing-shapes-to-find-area-add-indian-accent 2025-06-08T17:08:59.076161332Z Decomposing shapes to find area: add Let's find the area of an irregular 10-sided shape by breaking it into smaller rectangles. We'll learn to decompose complex shapes, calculate the area of each rectangle, and combine those areas to find the total area, making the topic engaging and enjoyable. Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Decomposing shapes to find area: add Let's find the area of an irregular 10-sided shape by breaking it into smaller rectangles. We'll learn to decompose complex shapes, calculate the area of each rectangle, and combine those areas to find the total area, making the topic engaging and enjoyable. https://cdn.kastatic.org/ka-youtube-converted/QXvc5KmqH7c.mp4/QXvc5KmqH7c.mp4 191 Perimeter and Area https://www.khanacademy.org/math/class-6-ncf/x04ca845a9a148c80:perimeter-and-area/x04ca845a9a148c80:decompose-figures-to-find-area/v/decomposing-shapes-to-find-area-subtract-indian-accent 2025-06-08T17:08:59.076161332Z Decomposing shapes to find area: subtract Lindsay finds the area of an irregular shape by decomposing it into 2 rectangles and subtracting the area of the rectangles.  Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Decomposing shapes to find area: subtract Lindsay finds the area of an irregular shape by decomposing it into 2 rectangles and subtracting the area of the rectangles.  https://cdn.kastatic.org/ka-youtube-converted/4L0i_l3dPSE.mp4/4L0i_l3dPSE.mp4 159 Perimeter and Area https://www.khanacademy.org/math/cc-third-grade-math/imp-geometry/imp-decompose-figures-to-find-area/e/decompose-shapes-to-find-area 2026-04-07T23:17:37.123726494Z Decompose figures to find area Practice decomposing irregular shapes to find their area.   Lindsay Spears exercise https://www.khanacademy.org/math/3rd-grade-math-eureka-squared-aligned/x9133ebbd39a8dd58:geometry-measurement-and-data/x9133ebbd39a8dd58:solve-problems-to-determine-the-perimeters-of-rectangles-with-the-same-area/v/comparing-areas-and-perimeters-of-rectangles-indian-accent 2025-06-08T17:08:59.076161332Z Comparing areas and perimeters of rectangles Sal compares the areas and perimeters of rectangles to a given rectangle. Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Comparing areas and perimeters of rectangles Sal compares the areas and perimeters of rectangles to a given rectangle. https://cdn.kastatic.org/ka-youtube-converted/qqYwAZh5rKI.mp4/qqYwAZh5rKI.mp4 317 Perimeter and Area 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-third-grade-math/3rd-perimeter/imp-comparing-area-and-perimeter/e/area-perimeter-word-problems 2026-04-30T18:30:41.846286703Z Area and perimeter word problems Solve 1- and 2-step word problems involving area of rectangles and perimeter of polygons. Lindsay exercise