https://www.khanacademy.org/math/ka-math-class-9/x152b0968b8680a8d:introduction-to-euclid-s-geometry-ncert-new/x152b0968b8680a8d:untitled-331/v/euclid-as-the-father-of-geometry-indian-accent 2025-07-25T07:07:59.607935933Z Euclid as the father of geometry Euclid, often called the father of geometry, changed the way we learn about shapes with his 13-book series, Euclid's Elements. He used basic ideas called axioms or postulates to create solid proofs and figure out new ideas called theorems and propositions. Studying Euclidean geometry helps us think better and solve problems more effectively. Khan Academy video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Euclid as the father of geometry Euclid, often called the father of geometry, changed the way we learn about shapes with his 13-book series, Euclid's Elements. He used basic ideas called axioms or postulates to create solid proofs and figure out new ideas called theorems and propositions. Studying Euclidean geometry helps us think better and solve problems more effectively. https://cdn.kastatic.org/ka-youtube-converted/Hx60EAqCMrQ.mp4/Hx60EAqCMrQ.mp4 518 Revisiting basic geometry https://www.khanacademy.org/math/revision-mh-math-class-6/x01cb2212e31ce997:week-1/x01cb2212e31ce997:basic-concepts-in-geometry/v/lines-line-segments-rays-indian-accent 2025-06-04T10:04:13.13703146Z Lines, line segments, & rays Learn the difference between lines, line segments, and rays.  Kalakrit (Dubbing) video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Lines, line segments, & rays Learn the difference between lines, line segments, and rays.  https://cdn.kastatic.org/ka-youtube-converted/xNWmto_kwzk.mp4/xNWmto_kwzk.mp4 218 Revisiting basic geometry https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-lines-line-segments-and-rays/e/recognizing_rays_lines_and_line_segments 2025-09-29T06:00:57.283947377Z Identify points, lines, line segments, rays, and angles Recognize points, lines, line segments, rays, and angles in geometric figures. Christopher Wobbles Seymour exercise https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-angle-introduction/e/angle_types 2025-05-27T10:20:27.404259006Z Angle types Determine if an angle is acute, right, or obtuse.  A protractor is provided. Ben Alpert exercise