https://www.khanacademy.org/math/class-7-ncf/x063f95a40c290960:expressions-using-letter-numbers/x063f95a40c290960:simplification-of-algebraic-expression-part-1/v/perimeter-of-a-rectangle-using-variables-algebra-class-6-india-math-khan-academy 2020-11-03T12:02:05Z Perimeter of a rectangle using variables Let's learn how to write the perimeter for any rectangle in the language of mathematics using variables. Aanand Srinivas video https://cdn.kastatic.org/googleusercontent/SRQdQqrIxPmCDDenrBHmd13YhPRzfFo19Y94jicYJpASbRMeHVZLgC904KO71jhAW_2bnXEI-rPi38eKC6Kq5g0o Perimeter of a rectangle using variables Let's learn how to write the perimeter for any rectangle in the language of mathematics using variables. https://cdn.kastatic.org/ka-youtube-converted/EnKre0h2An4.mp4/EnKre0h2An4.mp4 330 Perimeter and area https://www.khanacademy.org/math/class-7-ncf/x063f95a40c290960:expressions-using-letter-numbers/x063f95a40c290960:the-notion-of-letter-numbers/v/perimeter-of-a-square-using-variables-algebra-class-6-india-math-khan-academy 2020-10-07T19:09:49Z Perimeter of a square using variables Let's learn how to write the perimeter for any square in the language of mathematics using variables. Aanand Srinivas video https://cdn.kastatic.org/googleusercontent/apoLmdVvrLsKeff_g4For8ZKF80v-RYsNGy_Sdo9JruyibZldcGis60Q0kF17We4PPVRVs10pVHgfs6dL9ibSTmw Perimeter of a square using variables Let's learn how to write the perimeter for any square in the language of mathematics using variables. https://cdn.kastatic.org/ka-youtube-converted/ezPWpQit2FU.mp4/ezPWpQit2FU.mp4 275 Perimeter and area https://www.khanacademy.org/math/revision-mr-class-7-term-2/x34b615b2e8bb343d:week-2-revision-mr-class-7-term-2-math/x34b615b2e8bb343d:perimeter-and-area/v/comparing-areas-word-problem-indian-accent 2025-06-06T15:33:38.563209632Z Comparing areas word problem Sal compares the area of two posters using their side-lengths. Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Comparing areas word problem Sal compares the area of two posters using their side-lengths. https://cdn.kastatic.org/ka-youtube-converted/0c0omE8x5ts.mp4/0c0omE8x5ts.mp4 136 Perimeter and area 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/class-6-ncf/x04ca845a9a148c80:perimeter-and-area/x04ca845a9a148c80:area-of-triangle/v/area-of-a-triangle-indian-accent 2025-06-06T15:33:38.563209632Z 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. Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw 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/qK-UUd3IlqQ.mp4/qK-UUd3IlqQ.mp4 326 Perimeter and area 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/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 Perimeter and area https://www.khanacademy.org/math/class-9-tg/x06d55bfa213a79fd:surface-areas-and-volumes/x06d55bfa213a79fd:surface-area-of-cuboid-and-cube/e/b8-surface-area-of-cube-and-cuboid 2025-02-24T09:39:19.049669771Z Surface area of cube and cuboid Surface area of cube and cuboid ashish exercise https://www.khanacademy.org/math/revision-mr-class-7-term-2/x34b615b2e8bb343d:week-2-revision-mr-class-7-term-2-math/x34b615b2e8bb343d:perimeter-and-area/e/revision-perimeter-and-area 2026-01-28T03:50:33.306290623Z Revision perimeter and area . Khan Academy exercise