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 Angles intro 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 Angles intro https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-angle-introduction/a/angle-basics-review 2021-06-30T20:49:34Z Angle basics review Review what an angle is and how an angle is measured. article 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-fourth-grade-math/plane-figures/imp-angle-introduction/v/acute-right-and-obtuse-angles 2021-06-30T20:49:30Z Acute, right, & obtuse angles Acute angles measure less than 90 degrees.  Right angles measure 90 degrees.  Obtuse angles measure more than 90 degrees.  Learn about angles types and see examples of each. Sal Khan video https://cdn.kastatic.org/googleusercontent/0TrIIisE8BxVp_Bs5Co3G8RXtYcnmx9zu5pR2My5GUcj1JjSm5_G6kkQ4ZMUk0Ln1ry1Q5I7HXnYXTX1BGCdUOnJ Acute, right, & obtuse angles Acute angles measure less than 90 degrees.  Right angles measure 90 degrees.  Obtuse angles measure more than 90 degrees.  Learn about angles types and see examples of each. https://cdn.kastatic.org/ka-youtube-converted/ALhv3Rlydig.mp4/ALhv3Rlydig.mp4 332 Angles intro 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 https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-angle-introduction/v/recognizing-angles-examples 2021-06-30T20:49:26Z Recognizing angles Sal identifies acute, obtuse, and right angles in diagrams and pictures. Sal Khan video https://cdn.kastatic.org/googleusercontent/TSOfNlrgBlkSftUPPOoLCmGhIzgd2iNRa8PM7SrelbRsiDTlUhwf-_BJ7ZspSr6-MZhuguc9oZ4TU92ut_4syhM Recognizing angles Sal identifies acute, obtuse, and right angles in diagrams and pictures. https://cdn.kastatic.org/ka-youtube-converted/B0R3MJOrST0.mp4/B0R3MJOrST0.mp4 135 Angles intro https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-angle-introduction/e/recognizing-angles 2025-05-27T12:12:40.926204724Z Recognize angles in figures Determine if angles in shapes and pictures are acute, right, or obtuse. Christopher Wobbles Seymour exercise https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-angle-introduction/v/angle-sense-example 2021-06-30T20:49:32Z Identifying an angle Sal matches pictures of angles to their degrees. Sal Khan video https://cdn.kastatic.org/googleusercontent/Pyujn_3Ou49usXWDTBtTWdNBN2dBFOqwP5W7wodNMOEEFI9Rv5la3ecQVq6C28kHk7wC3dE1uD48b22aERBogfE Identifying an angle Sal matches pictures of angles to their degrees. https://cdn.kastatic.org/ka-youtube-converted/2mzuFKCuDg4.mp4/2mzuFKCuDg4.mp4 123 Angles intro https://www.khanacademy.org/math/cc-fourth-grade-math/imp-geometry-2/imp-angles-in-circles/e/benchmark-angles 2026-04-07T22:23:57.656416987Z Benchmark angles Visually identify common benchmark angles.  Sandy Knight exercise