https://www.khanacademy.org/math/geometry/hs-geo-transformations/hs-geo-intro-euclid/v/language-and-notation-of-basic-geometry 2023-05-07T10:16:56.874628902Z Terms & labels in geometry Explore geometry fundamentals, including points, line segments, rays, and lines. Understand dimensions and how these elements form shapes and patterns. Learn key geometric terms like colinear points, midpoints, and vertices, and enhance your knowledge of geometry. Improve your skills and discover the world of shapes and space. Sal Khan video https://cdn.kastatic.org/googleusercontent/JZ8W-h9naNsX4Bu7I3J_5qfWIjAykN14mxQkvlXIwmb6-7InlR0-0Dj2pRG-BSUJK9iu7Z1-byiuEnQmU43OG9lNJA Terms & labels in geometry Explore geometry fundamentals, including points, line segments, rays, and lines. Understand dimensions and how these elements form shapes and patterns. Learn key geometric terms like colinear points, midpoints, and vertices, and enhance your knowledge of geometry. Improve your skills and discover the world of shapes and space. https://cdn.kastatic.org/ka-youtube-converted/il0EJrY64qE.mp4/il0EJrY64qE.mp4 778 Basic Understanding of Geometry https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-lines-line-segments-and-rays/v/lines-line-segments-and-rays 2021-06-30T20:49:37Z Lines, line segments, & rays Learn the difference between lines, line segments, and rays.  Sal Khan video https://cdn.kastatic.org/googleusercontent/-xyW_oyfXLhP58Whc8Nlu4eoLWejjfZQe7ogXZhJInSy_W8F1MMsh8OSZzLWVNmSomsC9AXh7ySDFkQEyQxzN3V4 Lines, line segments, & rays Learn the difference between lines, line segments, and rays.  https://cdn.kastatic.org/ka-youtube-converted/JcqCf762y9w.mp4/JcqCf762y9w.mp4 218 Basic Understanding of Geometry https://www.khanacademy.org/math/geometry-home/geometry-lines/geometry-lines-rays/v/identifying-rays 2023-05-12T21:01:01.897246564Z Identifying rays A ray is a shape that starts at one point and extends forever in one direction. To identify a ray in a picture, look for a line that has one endpoint (the point where the ray starts) and an arrow on the other end (to show that it keeps going). Sal Khan video https://cdn.kastatic.org/googleusercontent/rodBwvMjj9BPDKlUx5Y_jN2YjRxWioM8Vi9aU98GS09TupB7TZtrChOrWYuqdnm-tQh5l7crtWtzOnEYj2EmkgM Identifying rays A ray is a shape that starts at one point and extends forever in one direction. To identify a ray in a picture, look for a line that has one endpoint (the point where the ray starts) and an arrow on the other end (to show that it keeps going). https://cdn.kastatic.org/ka-youtube-converted/w9jEq6dmqPg.mp4/w9jEq6dmqPg.mp4 340 Basic Understanding of Geometry https://www.khanacademy.org/math/geometry-home/geometry-lines/geometry-lines-rays/e/drawing-lines 2026-04-07T23:17:37.123726494Z Draw rays, lines, & line segments Draw rays, lines, and line segments with given points.   Justin Helps exercise 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/geometry-home/geometry-shapes/geometry-curves-and-polygons/e/open-and-closed-curves 2026-04-07T22:23:57.656416987Z Open and closed curves Let's spot the difference between an open and a closed curve. Aanand exercise https://www.khanacademy.org/math/revision-term-1-tg-math-lass-6/x0ef789b44aba665e:week-3/x0ef789b44aba665e:basic-geometrical-ideas/e/interior-and-exterior-of-closed-concepts-6th 2026-04-07T22:59:30.107127435Z Position of a point in curves and polygons Position of a point in curves and polygons supriya exercise https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-geometry/cc-7th-angles/v/angle-basics 2021-06-30T20:49:32Z Angles: introduction Two rays that share the same endpoint form an angle. Learn about angles and the parts of an angle, like the vertex. Sal Khan video https://cdn.kastatic.org/googleusercontent/OiWEcQJuUwuBizhFxcflrEDtYQE0F8Hl2xR3vqY3VA0eSSYntfsQiuoz69dkBWU9pqdIe2Sy99yqWwlJjX_E1JFmLQ Angles: introduction Two rays that share the same endpoint form an angle. Learn about angles and the parts of an angle, like the vertex. https://cdn.kastatic.org/ka-youtube-converted/H-de6Tkxej8.mp4/H-de6Tkxej8.mp4 409 Basic Understanding of Geometry https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-angle-introduction/e/angle-basics 2021-06-30T20:49:35Z Angle basics Determine which angle has a greater measure by looking at the size of the opening between the angle's rays. Lindsay exercise https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-angle-introduction/v/naming-angles 2021-06-30T20:49:37Z Naming angles Sal names angles based on their vertex and endpoints. Sal Khan video https://cdn.kastatic.org/googleusercontent/NdvW6uOwIsTqM-ULzK_B1Le10viMa6aceiPx5uB2HYh1vRL5_xmuE7N_LLDXH6bo_OFW2VF5AKPso7B5bQeNpsnp Naming angles Sal names angles based on their vertex and endpoints. https://cdn.kastatic.org/ka-youtube-converted/6vRgqB0PSXE.mp4/6vRgqB0PSXE.mp4 71 Basic Understanding of Geometry https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-geometry/cc-7th-angles/e/naming-angles 2025-09-26T06:00:44.003534089Z Name angles Name angles by their vertex, endpoints, or labels.   Sandy Knight exercise https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-geometry/cc-7th-angles/v/complementary-and-supplementary-angles 2021-07-02T09:35:33Z Complementary & supplementary angles Learn about complementary and supplementary angles, as well as the definitions of adjacent and straight angles. Sal Khan video https://cdn.kastatic.org/googleusercontent/qDVRlJF769umQwhK0k5Gws2kWYPwSZplfCVSDfogMTaAgwYWW_U-6rLm70oo6ChLWcrKMyh4Np5FI6xpBfkMBSDydw Complementary & supplementary angles Learn about complementary and supplementary angles, as well as the definitions of adjacent and straight angles. https://cdn.kastatic.org/ka-youtube-converted/BTnAlNSgNsY.mp4/BTnAlNSgNsY.mp4 511 Basic Understanding of Geometry https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-geometry/cc-7th-angles/e/complementary_and_supplementary_angles 2025-02-06T19:34:52.815179935Z Complementary and supplementary angles (visual) Use your knowledge about complementary and supplementary angles to find missing angles. Marcia Lee exercise https://www.khanacademy.org/math/cc-seventh-grade-math/cc-7th-geometry/cc-7th-angles/e/complementary-and-supplementary-angles--no-visual- 2024-09-05T20:39:26.312313729Z Complementary and supplementary angles (no visual) Use complementary and supplementary angles to solve for a missing angle measure. Lindsay exercise