https://www.khanacademy.org/math/cc-fifth-grade-math/properties-of-shapes/imp-quadrilaterals-2/v/quadrilateral-overview 2022-11-16T04:22:43.7414897Z Intro to quadrilateral There are many different types of quadrilaterals. A quadrilateral is defined as a two-dimensional shape with four sides, four vertices, and four angles. There are two main types: concave and convex. There are also various subcategories of convex quadrilaterals, such as trapezoids, parallelograms, rectangles, rhombi, and squares. Sal Khan video https://cdn.kastatic.org/googleusercontent/y0z2Dx227KWvT4VD_hG_TqpMYbxEXxdTPRSOKVc6aeWVt99HQzi2PyCHYK-EJWubSGHfH7rO_qaoBpweufvY7mrJ Intro to quadrilateral There are many different types of quadrilaterals. A quadrilateral is defined as a two-dimensional shape with four sides, four vertices, and four angles. There are two main types: concave and convex. There are also various subcategories of convex quadrilaterals, such as trapezoids, parallelograms, rectangles, rhombi, and squares. https://cdn.kastatic.org/ka-youtube-converted/Ka82QC4QvGA.mp4/Ka82QC4QvGA.mp4 504 Quadrilaterals https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-classifying-geometric-shapes/v/quadrilateral-properties 2021-06-30T20:49:37Z Quadrilateral properties Learn about the properties of quadrilaterals, parallelograms, trapezoids, rhombuses, rectangles, and squares. Sal Khan video https://cdn.kastatic.org/googleusercontent/JGC4e5CKmDPc0EaGsoC76iS72j_U_G4PY5Pqha8QYVqeze74OxRmhuICMKdpz8HS_llastP2FKeGE1eDazyEHLI Quadrilateral properties Learn about the properties of quadrilaterals, parallelograms, trapezoids, rhombuses, rectangles, and squares. https://cdn.kastatic.org/ka-youtube-converted/5CeBlu260Rw.mp4/5CeBlu260Rw.mp4 307 Quadrilaterals https://www.khanacademy.org/math/cc-fifth-grade-math/properties-of-shapes/imp-quadrilaterals-2/v/quadrilateral-types-exercise 2023-07-17T20:04:18.610848495Z Quadrilateral types Learn to identify quadrilaterals such as kites, trapezoids, parallelograms, rhombuses, rectangles, and squares by side length, presence of parallel sides, and angle type. Sal Khan video https://cdn.kastatic.org/googleusercontent/HUjOvmPMa3weC4ohLEbNYrz2dEK6nSP4Uh1T5bWCrghuhebQwqwRbENk8-hpBp60exi1tPolvDkkOr1U_T96F3y5FQ Quadrilateral types Learn to identify quadrilaterals such as kites, trapezoids, parallelograms, rhombuses, rectangles, and squares by side length, presence of parallel sides, and angle type. https://cdn.kastatic.org/ka-youtube-converted/wPZIa3SjPF0.mp4/wPZIa3SjPF0.mp4 169 Quadrilaterals https://www.khanacademy.org/math/class-7-tg/x476671d9fb9d8978:quadrilaterals/x476671d9fb9d8978:types-of-quadrilaterals-and-their-properties/v/the-sum-of-interior-angles-of-a-quadrilateral 2026-01-16T08:50:31.625125949Z The sum of interior angles of a quadrilateral This video proves the Angle Sum Property of a quadrilateral using a clever trick: splitting the shape into two triangles. It’s a fundamental geometry skill for Class 8-10 that makes solving polygon problems easy. Stick around until the end to test your knowledge with practice questions! Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw The sum of interior angles of a quadrilateral This video proves the Angle Sum Property of a quadrilateral using a clever trick: splitting the shape into two triangles. It’s a fundamental geometry skill for Class 8-10 that makes solving polygon problems easy. Stick around until the end to test your knowledge with practice questions! https://cdn.kastatic.org/ka-youtube-converted/BoQgG_TYAG8.mp4/BoQgG_TYAG8.mp4 565 Quadrilaterals https://www.khanacademy.org/math/class-9-tg/x06d55bfa213a79fd:quadrilaterals/x06d55bfa213a79fd:properties-of-parallelograms/v/proof-opposite-sides-of-a-parallelogram-indian-accent 2025-06-04T10:04:13.13703146Z Proof: Opposite sides of a parallelogram Sal proves that a figure is a parallelogram if and only if opposite sides are congruent. Kalakrit (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Proof: Opposite sides of a parallelogram Sal proves that a figure is a parallelogram if and only if opposite sides are congruent. https://cdn.kastatic.org/ka-youtube-converted/gtDZ9hSKSUA.mp4/gtDZ9hSKSUA.mp4 509 Quadrilaterals https://www.khanacademy.org/math/uk-math-class-8/x40384ea0c3a0cfc9:understanding-quadrilaterals-ncert-new/x40384ea0c3a0cfc9:kinds-of-quadrilaterals/v/proof-sum-of-adjacent-angles-of-parallelogram 2025-05-15T14:44:06.823245258Z Proof: Sum of adjacent angles of parallelogram In this video, we explore a fundamental property of parallelograms: the fact that adjacent angles are always supplementary. Through a clear and methodical proof, we demonstrate that the sum of any two adjacent angles in a parallelogram equals 180 degrees. By using essential geometric concepts and logical reasoning, we break down why this property holds true in every case. Mahak Wasan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Proof: Sum of adjacent angles of parallelogram In this video, we explore a fundamental property of parallelograms: the fact that adjacent angles are always supplementary. Through a clear and methodical proof, we demonstrate that the sum of any two adjacent angles in a parallelogram equals 180 degrees. By using essential geometric concepts and logical reasoning, we break down why this property holds true in every case. https://cdn.kastatic.org/ka-youtube-converted/YxeYR1x-jfA.mp4/YxeYR1x-jfA.mp4 129 Quadrilaterals https://www.khanacademy.org/math/class-7-tg/x476671d9fb9d8978:quadrilaterals/x476671d9fb9d8978:making-figures-with-a-tangram/v/making-figures-with-a-tangram 2026-01-16T08:50:31.625125949Z Making figures with a tangram Unlock the secrets of the ancient seven-piece Tangram puzzle! This video guides you through arranging geometric shapes to construct perfect figures like trapeziums and rectangles. You'll even learn how to assemble a creative cat using only these seven pieces. It’s a brilliant way for students in Class 8-10 to boost spatial reasoning and visualize geometry in a fun, hands-on way. Grab your tangram set and see how many figures you can master! Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Making figures with a tangram Unlock the secrets of the ancient seven-piece Tangram puzzle! This video guides you through arranging geometric shapes to construct perfect figures like trapeziums and rectangles. You'll even learn how to assemble a creative cat using only these seven pieces. It’s a brilliant way for students in Class 8-10 to boost spatial reasoning and visualize geometry in a fun, hands-on way. Grab your tangram set and see how many figures you can master! https://cdn.kastatic.org/ka-youtube-converted/T6FsOjwEnM8.mp4/T6FsOjwEnM8.mp4 259 Quadrilaterals https://www.khanacademy.org/math/revision-tg-math-class-7/x49a72ea63977ab7d:week-3/x49a72ea63977ab7d:quadrilaterals/e/revision-quadrilaterals-tg-class-7 2026-02-18T21:20:35.275198076Z Revision quadrilaterals TG class 7 . Khan Academy exercise