https://www.khanacademy.org/math/revision-term-1-tg-math-lass-6/x0ef789b44aba665e:week-3/x0ef789b44aba665e:measures-of-lines-and-angles/v/parallel-and-intersecting-lines 2024-05-29T15:05:13.425727304Z Parallel and Intersecting lines Description This video describes the concept of parallel and intersecting lines this video piece is a part of video "Basic geometrical terms" Devashish Phadnis video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Parallel and Intersecting lines Description This video describes the concept of parallel and intersecting lines this video piece is a part of video "Basic geometrical terms" https://cdn.kastatic.org/ka-youtube-converted/ypHqclZK1Os.mp4/ypHqclZK1Os.mp4 123 Parallel lines https://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-geometry/cc-8th-angles-between-lines/v/angles-formed-by-parallel-lines-and-transversals 2023-05-12T21:01:01.897246564Z Angles, parallel lines, & transversals Parallel lines are lines in the same plane that go in the same direction and never intersect. When a third line, called a transversal, crosses these parallel lines, it creates angles. Some angles are equal, like vertical angles (opposite angles) and corresponding angles (same position at each intersection). Sal Khan video https://cdn.kastatic.org/googleusercontent/Vz_NMEoL9pcokuLJEAFY_U-n9SIzbtc56vA_P8hGFXLXAZEIdmfteizOxfIHqBk4kThnx6aglnEoGdRMahNp4OyW3w Angles, parallel lines, & transversals Parallel lines are lines in the same plane that go in the same direction and never intersect. When a third line, called a transversal, crosses these parallel lines, it creates angles. Some angles are equal, like vertical angles (opposite angles) and corresponding angles (same position at each intersection). https://cdn.kastatic.org/ka-youtube-converted/H-E5rlpCVu4.mp4/H-E5rlpCVu4.mp4 427 Parallel lines https://www.khanacademy.org/math/class-7-ncf/x063f95a40c290960:parallel-and-intersecting-lines/x063f95a40c290960:parallel-lines-and-transversal/v/missing-angles-with-a-transversal-indian-accent 2025-06-04T10:04:13.13703146Z Missing angles with a transversal When a third line called a transversal crosses two parallel lines, we can find the measures of angles using properties like corresponding angles, vertical angles, and supplementary angles. If we know just one of the angle measurements, these properties help us find all the missing angle measurements. Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Missing angles with a transversal When a third line called a transversal crosses two parallel lines, we can find the measures of angles using properties like corresponding angles, vertical angles, and supplementary angles. If we know just one of the angle measurements, these properties help us find all the missing angle measurements. https://cdn.kastatic.org/ka-youtube-converted/I3mNis-YPG8.mp4/I3mNis-YPG8.mp4 137 Parallel lines https://www.khanacademy.org/math/revision-mh-math-class-6/x01cb2212e31ce997:week-3/x01cb2212e31ce997:triangles-and-their-properties/v/angles-in-a-triangle-sum-to-180-proof-indian-accent 2025-06-04T10:11:55.11792485Z Angles in a triangle sum to 180° proof The sum of the interior angle measures of a triangle always adds up to 180;. We can draw a line parallel to the base of any triangle through its third vertex. Then we use transversals, vertical angles, and corresponding angles to rearrange those angle measures into a straight line, proving that they must add up to 180. Skyloom (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Angles in a triangle sum to 180° proof The sum of the interior angle measures of a triangle always adds up to 180;. We can draw a line parallel to the base of any triangle through its third vertex. Then we use transversals, vertical angles, and corresponding angles to rearrange those angle measures into a straight line, proving that they must add up to 180. https://cdn.kastatic.org/ka-youtube-converted/-IR3SJfOjIc.mp4/-IR3SJfOjIc.mp4 247 Parallel lines https://www.khanacademy.org/math/class-7-ncf/x063f95a40c290960:parallel-and-intersecting-lines/x063f95a40c290960:parallel-lines-and-transversal/v/identifying-parallel-lines-from-the-given-pair-of-angles-made-by-transversal 2025-06-03T03:42:04.110515269Z Identifying parallel lines from the given pair of angles made by transversal Ever wondered how to identify parallel lines with ease? Join us in this enlightening video where we break down the concepts of corresponding angles, alternate interior angles, and co-interior angles. In this visually-rich and unique approach, we make it incredibly simple for you to spot parallel lines using clear criteria and stunning visuals. Mahak Wasan video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Identifying parallel lines from the given pair of angles made by transversal Ever wondered how to identify parallel lines with ease? Join us in this enlightening video where we break down the concepts of corresponding angles, alternate interior angles, and co-interior angles. In this visually-rich and unique approach, we make it incredibly simple for you to spot parallel lines using clear criteria and stunning visuals. https://cdn.kastatic.org/ka-youtube-converted/QguMPTWw4KQ.mp4/QguMPTWw4KQ.mp4 194 Parallel lines https://www.khanacademy.org/math/revision-mr-class-9-term-2/x6e82706cbb5834ba:week-1/x6e82706cbb5834ba:parallel-lines/e/revision-parallel-lines-mh-class-9 2026-02-03T09:22:16.808346173Z Revision parallel lines MH class 9 . Khan Academy exercise