https://www.khanacademy.org/math/math-1-illustrative-math-aligned/x193529144fa1e1f6:congruence/x193529144fa1e1f6:congruent-triangles-part-1/v/corresponding-parts-of-congruent-triangles-are-congruent-indian-accent 2025-06-04T10:11:55.11792485Z Corresponding parts of congruent triangles are congruent When two triangles are congruent, we can know that all of their corresponding sides and angles are congruent too! Kalakrit (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Corresponding parts of congruent triangles are congruent When two triangles are congruent, we can know that all of their corresponding sides and angles are congruent too! https://cdn.kastatic.org/ka-youtube-converted/FpMUWRr4QCY.mp4/FpMUWRr4QCY.mp4 363 Triangles https://www.khanacademy.org/math/class-7-ncf/x063f95a40c290960:geometric-twins/x063f95a40c290960:congruence-of-triangles/v/triangle-congruence-postulatescriteria-indian-accent 2025-06-04T10:04:13.13703146Z Triangle congruence postulates/criteria This video introduces and justifies the SSS, SAS, ASA and AAS postulates for congruent triangles. He also shows that AAA is only good for similarity. For SSA, better to watch next video. Kalakrit (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Triangle congruence postulates/criteria This video introduces and justifies the SSS, SAS, ASA and AAS postulates for congruent triangles. He also shows that AAA is only good for similarity. For SSA, better to watch next video. https://cdn.kastatic.org/ka-youtube-converted/QtFJGJ5nESI.mp4/QtFJGJ5nESI.mp4 807 Triangles https://www.khanacademy.org/math/class-7-ncf/x063f95a40c290960:geometric-twins/x063f95a40c290960:congruence-of-triangles/v/what-is-rhs-congruency-and-why-rhs-works 2025-06-03T10:39:13.727334631Z What is RHS congruency and Why RHS works Discover the magic behind the RHS (Right Angle-Hypotenuse-Side) congruence rule in this insightful video! Even though RHS may seem like a special case of the SSA condition—typically unreliable for proving triangle congruence—this rule holds firm under specific circumstances. We dive deep into why RHS is valid, exploring the unique properties of right-angled triangles that make this rule work. Through a step-by-step proof, we demonstrate how the hypotenuse and one corresponding leg are enough to establish congruence, ensuring identical triangles every time. Mahak Wasan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw What is RHS congruency and Why RHS works Discover the magic behind the RHS (Right Angle-Hypotenuse-Side) congruence rule in this insightful video! Even though RHS may seem like a special case of the SSA condition—typically unreliable for proving triangle congruence—this rule holds firm under specific circumstances. We dive deep into why RHS is valid, exploring the unique properties of right-angled triangles that make this rule work. Through a step-by-step proof, we demonstrate how the hypotenuse and one corresponding leg are enough to establish congruence, ensuring identical triangles every time. https://cdn.kastatic.org/ka-youtube-converted/r7V123uDgYU.mp4/r7V123uDgYU.mp4 331 Triangles https://www.khanacademy.org/math/class-9-tg/x06d55bfa213a79fd:triangles/x06d55bfa213a79fd:properties-of-triangles/v/proofs-concerning-isosceles-triangles-indian-accent 2025-06-04T10:04:13.13703146Z Proofs concerning isosceles triangles Lets proves that the base angles in isosceles triangles are congruent, and conversely, that triangles with congruent base angles are isosceles. He also proves that the perpendicular to the base of an isosceles triangle bisects it. Aakash Bagga video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Proofs concerning isosceles triangles Lets proves that the base angles in isosceles triangles are congruent, and conversely, that triangles with congruent base angles are isosceles. He also proves that the perpendicular to the base of an isosceles triangle bisects it. https://cdn.kastatic.org/ka-youtube-converted/SV5MpEfTYOg.mp4/SV5MpEfTYOg.mp4 543 Triangles https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-geometry/cc-7th-constructing-geometric-shapes/v/triangle-inqequality-theorem 2021-07-02T09:35:27Z Triangle inequality theorem Intuition behind the triangle inequality theorem Sal Khan video https://cdn.kastatic.org/googleusercontent/HVpDfgDPIvUqFIbXtljJrLuUlHyeiWRomrkj6JeKGb5TPNgSbX0u_nX0Aj7RYaPpLreDkNourl80NDiBdD8tPeQ Triangle inequality theorem Intuition behind the triangle inequality theorem https://cdn.kastatic.org/ka-youtube-converted/KlKYvbigBqs.mp4/KlKYvbigBqs.mp4 352 Triangles https://www.khanacademy.org/math/7th-engage-ny/engage-7th-module-6/7th-module-6-topic-b/v/ordering-triangle-sides-and-angles 2022-10-07T03:14:35.242117993Z Ordering triangle sides and angles example Sal first solves a problem where he orders the sides of a triangle given the angles, then solves a problem where he orders the angles of a triangle given the sides. video https://cdn.kastatic.org/ka_thumbnails_cache/582a6816-c904-45b1-9d8c-24a31003bbac_1280_720_base.png Ordering triangle sides and angles example Sal first solves a problem where he orders the sides of a triangle given the angles, then solves a problem where he orders the angles of a triangle given the sides. https://cdn.kastatic.org/ka-youtube-converted/I5eTOBsvUK8.mp4/I5eTOBsvUK8.mp4 169 Triangles https://www.khanacademy.org/math/revision-tg-math-class-9/x6c9499d6e7016acd:week-2/x6c9499d6e7016acd:triangles/e/revision-triangles-tg-class-9 2026-02-18T21:20:35.275198076Z Revision triangles TG class 9 . Khan Academy exercise