https://www.khanacademy.org/math/geometry/hs-geo-analytic-geometry/hs-geo-parallel-perpendicular-lines/v/parallel-and-perpendicular-lines-intro 2021-06-30T20:49:34Z Parallel & perpendicular lines intro Parallel lines never intersect, and perpendicular lines intersect at a 90 degree angle. Learn how to identify parallel and perpendicular lines. Sal Khan video https://cdn.kastatic.org/googleusercontent/CRTGzDu0cHddrkhiOFmwrkf50_2Kd0kMEh9xECcGSiBHgA0RMavpcbIUUkOTzPKm6jUKCuCa1fUipy280HvNtevJEQ Parallel & perpendicular lines intro Parallel lines never intersect, and perpendicular lines intersect at a 90 degree angle. Learn how to identify parallel and perpendicular lines. https://cdn.kastatic.org/ka-youtube-converted/V0xounKGEXs.mp4/V0xounKGEXs.mp4 128 Parallel and perpendicular lines https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-parallel-and-perpendicular/e/recognizing-parallel-and-perpendicular-lines 2024-06-07T06:11:44.832261717Z Identify parallel and perpendicular lines Recognize parallel and perpendicular lines in geometric figures and pictures.  Christopher Wobbles Seymour exercise https://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-geometry/cc-8th-angles-between-lines/v/identifying-parallel-and-perpendicular-lines 2023-05-12T21:01:01.897246564Z Parallel & perpendicular lines Parallel lines are lines that never intersect, and they form the same angle when they cross another line. Perpendicular lines intersect at a 90-degree angle, forming a square corner. We can identify these lines using angles and symbols in diagrams. Sal Khan video https://cdn.kastatic.org/googleusercontent/PcuXlEbaHxzChubchbUd0bdEVQROnswU9iN3kZmGye3iZfHzIf_3SYhVwwxrzD8EN-ip61hIT490bsiCUZhIeiPq2w Parallel & perpendicular lines Parallel lines are lines that never intersect, and they form the same angle when they cross another line. Perpendicular lines intersect at a 90-degree angle, forming a square corner. We can identify these lines using angles and symbols in diagrams. https://cdn.kastatic.org/ka-youtube-converted/aq_XL6FrmGs.mp4/aq_XL6FrmGs.mp4 215 Parallel and perpendicular lines https://www.khanacademy.org/math/geometry/hs-geo-analytic-geometry/hs-geo-parallel-perpendicular-lines/v/classify-lines 2022-09-10T02:03:40.164764806Z Parallel & perpendicular lines from graph The slopes of parallel lines are equal, and the slopes of perpendicular lines are opposite reciprocals. This is a worked example of determining whether given lines are parallel or perpendicular. video https://cdn.kastatic.org/ka_thumbnails_cache/ccf3cc05-28e0-459b-b6d1-521eaf05413c_1280_720_base.png Parallel & perpendicular lines from graph The slopes of parallel lines are equal, and the slopes of perpendicular lines are opposite reciprocals. This is a worked example of determining whether given lines are parallel or perpendicular. https://cdn.kastatic.org/ka-youtube-converted/6riBTnlI4fw.mp4/6riBTnlI4fw.mp4 446 Parallel and perpendicular lines https://www.khanacademy.org/math/geometry/hs-geo-analytic-geometry/hs-geo-parallel-perpendicular-lines/e/classifying-lines-as-parallel--perpendicular--or-neither 2026-03-19T10:07:17.424260476Z Parallel & perpendicular lines from graph Given points that two lines go through or the graph of each line, classify the lines as parallel, perpendicular, or neither. . exercise https://www.khanacademy.org/math/geometry/hs-geo-analytic-geometry/hs-geo-parallel-perpendicular-eq/v/parallel-lines 2022-10-07T00:00:24.225559754Z Parallel lines from equation Sal determines which pairs out of a few given linear equations are parallel. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/94784bb9-4e26-49c9-ae3b-e807b8a34c01_1280_720_base.png Parallel lines from equation Sal determines which pairs out of a few given linear equations are parallel. https://cdn.kastatic.org/ka-youtube-converted/T-aCweuimis.mp4/T-aCweuimis.mp4 228 Parallel and perpendicular lines https://www.khanacademy.org/math/geometry/hs-geo-analytic-geometry/hs-geo-parallel-perpendicular-eq/v/parallel-lines-2 2022-10-07T00:00:24.225559754Z Parallel lines from equation (example 2) Sal determines which pairs out of a few given linear equations are parallel. Sal Khan video https://cdn.kastatic.org/ka_thumbnails_cache/42e58ef9-ca94-4d27-b084-497bc330663a_1280_720_base.png Parallel lines from equation (example 2) Sal determines which pairs out of a few given linear equations are parallel. https://cdn.kastatic.org/ka-youtube-converted/lOWXZFP8Vuc.mp4/lOWXZFP8Vuc.mp4 183 Parallel and perpendicular lines