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 Measures of angles 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/drawing-acute-right-and-obtuse-angles 2021-06-30T20:49:31Z Drawing acute, right and obtuse angles Learn how to draw acute, right, and obtuse angles with given points. Sal Khan video https://cdn.kastatic.org/googleusercontent/o2TonhaOTksJDG2GYnogr8_KSb2kBdKglPMAkrDCX12basBnHp8r8hhgLbT24-ZKl_tVnFAPZ-2u15lmg-6THbpd Drawing acute, right and obtuse angles Learn how to draw acute, right, and obtuse angles with given points. https://cdn.kastatic.org/ka-youtube-converted/4ZyTVTGVPgE.mp4/4ZyTVTGVPgE.mp4 160 Measures of angles https://www.khanacademy.org/math/geometry-home/geometry-angles/angle-types/e/drawing-right--acute--and-obtuse-angles 2025-02-13T04:57:25.728250847Z Draw right, acute, and obtuse angles Create an acute, right, or obtuse angle using a given vertex. Justin Helps exercise https://www.khanacademy.org/math/cc-fourth-grade-math/plane-figures/imp-angle-introduction/a/angle-types-review 2023-07-03T04:41:54.225407657Z Angle types review Review the following types of angles: acute, right, obtuse, and straight.  Identify and draw types of angles in some practice problems.   article 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 Measures of angles 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 Measures of angles https://www.khanacademy.org/math/cc-fourth-grade-math/imp-geometry-2/imp-measuring-angles/v/measuring-angles-in-degrees 2021-06-30T20:49:32Z Measuring angles in degrees Learn how to measure an angle with a protractor.   Sal Khan video https://cdn.kastatic.org/googleusercontent/AUN8zIwamVCnRbVrbNkTeBO9SpKe7AxHlEaNRb5uRVice-wM0qmnW-YuL_KiAeC99oc3B1LtSsEEtRXjOhR3PGg5 Measuring angles in degrees Learn how to measure an angle with a protractor.   https://cdn.kastatic.org/ka-youtube-converted/92aLiyeQj0w.mp4/92aLiyeQj0w.mp4 502 Measures of angles https://www.khanacademy.org/math/cc-fourth-grade-math/imp-geometry-2/imp-measuring-angles/v/using-a-protractor 2021-06-30T20:49:34Z Measuring angles using a protractor Learn to use a virtual protractor to measure angles. Sal Khan video https://cdn.kastatic.org/googleusercontent/fl9JqzAG4AES6K4YGfp4Aj6oDVKRNlLOERnZGNV26NZUICj8syJjkPPaVF371GWAEtBEhbQP1aiI3FbboRuvrd_Htw Measuring angles using a protractor Learn to use a virtual protractor to measure angles. https://cdn.kastatic.org/ka-youtube-converted/dw41PMWek6U.mp4/dw41PMWek6U.mp4 205 Measures of angles https://www.khanacademy.org/math/cc-fourth-grade-math/imp-geometry-2/imp-measuring-angles/v/measuring-angles 2021-06-30T20:49:37Z Measuring angles using a protractor 2 Sal measures several angles with a protractor. Sal Khan video https://cdn.kastatic.org/googleusercontent/El9nQtild7LvphLXXrc_VV8bcM_qv3fChQ23GfLVi38RV8WX7xbkNQPq9lw1aaIfC1dmftEVgaTRBGrhxRbSErKGiw Measuring angles using a protractor 2 Sal measures several angles with a protractor. https://cdn.kastatic.org/ka-youtube-converted/wJ37GJyViU8.mp4/wJ37GJyViU8.mp4 245 Measures of angles https://www.khanacademy.org/math/cc-fourth-grade-math/imp-geometry-2/imp-measuring-angles/e/measuring_angles 2025-03-28T04:39:37.342267172Z Measure angles Measure angles using a protractor.  Omar Rizwan exercise https://www.khanacademy.org/math/cc-fourth-grade-math/imp-geometry-2/imp-measuring-angles/e/drawing-angles 2026-04-07T23:36:17.218592739Z Draw angles Use a protractor to construct angles. Sandy Knight exercise