https://www.khanacademy.org/math/geometry/xff63fac4:hs-geo-conic-sections/hs-geo-circle-standard-equation/v/radius-and-center-for-a-circle-equation-in-standard-form 2021-06-08T19:10:24Z Features of a circle from its standard equation Sal finds the center and the radius of the circle whose equation is (x+3)^2+(y-4)^2=49. Sal Khan video https://cdn.kastatic.org/googleusercontent/5rX2mO1KtbbA3mknyYqqqJ7CI16rAzvA_IaoyoOg6qH2dyOECl4-P1B7iesXvsOGtMdBmjLjwGTBpqHtjDSkURvL Features of a circle from its standard equation Sal finds the center and the radius of the circle whose equation is (x+3)^2+(y-4)^2=49. https://cdn.kastatic.org/ka-youtube-converted/JvDpYlyKkNU.mp4/JvDpYlyKkNU.mp4 231 Equations of a circle https://www.khanacademy.org/math/geometry/xff63fac4:hs-geo-conic-sections/hs-geo-circle-standard-equation/e/equation_of_a_circle_1 2025-09-24T21:00:54.429253155Z Features of a circle from its standard equation Find the center and radius of a circle given the equation in standard form. Sid Patel exercise https://www.khanacademy.org/math/10th-grade-math-revised-k-to-10-3-terms/x06a77af3c81397cf:second-quarter/x06a77af3c81397cf:equations-of-a-circle/a/v2-sat-lesson-circle-equations 2022-10-18T02:23:40.2192308Z Circle equations | Lesson A guide to circle equations on the digital SAT article https://www.khanacademy.org/math/10th-grade-math-revised-k-to-10-3-terms/x06a77af3c81397cf:second-quarter/x06a77af3c81397cf:equations-of-a-circle/v/sat-math-s8-easier 2021-02-09T20:41:41Z Circle equations — Basic example Watch Sal work through a basic Circle equations problem. video https://cdn.kastatic.org/googleusercontent/qFwjx-8iD-6WeVg7_MTxjOYiTYzmHKWuqZ25pWwRy-le9vFxd5XhvBFnpTB-MuH8FOZlnUhPzwwBmlMP4GBmqPjF Circle equations — Basic example Watch Sal work through a basic Circle equations problem. https://cdn.kastatic.org/ka-youtube-converted/WJAX-eEufB0.mp4/WJAX-eEufB0.mp4 113 Equations of a circle https://www.khanacademy.org/math/10th-grade-math-revised-k-to-10-3-terms/x06a77af3c81397cf:second-quarter/x06a77af3c81397cf:equations-of-a-circle/v/sat-math-s8-harder 2021-02-09T20:41:41Z Circle equations — Harder example ​Watch Sal work through a harder Circle equations problem. video https://cdn.kastatic.org/googleusercontent/2Q_uNEbf6FMi4SHe16kPZL8DhHmu0mORjRDS8e_31ZSbueMAlHBwNsRvi2XvxoHVnAb6buJbQNGgq96hjlmSKmpi Circle equations — Harder example ​Watch Sal work through a harder Circle equations problem. https://cdn.kastatic.org/ka-youtube-converted/CPe4bXmL6Oo.mp4/CPe4bXmL6Oo.mp4 169 Equations of a circle https://www.khanacademy.org/math/geometry/xff63fac4:hs-geo-conic-sections/alg2-graphs-of-circles-intro/v/center-and-radius-of-circle-from-graph 2022-10-07T00:00:24.225559754Z Features of a circle from its graph Given a circle on the coordinate plane, Sal finds its center and its radius. video https://cdn.kastatic.org/ka_thumbnails_cache/8c591b84-ea65-40af-9807-94972de9f580_1280_720_base.png Features of a circle from its graph Given a circle on the coordinate plane, Sal finds its center and its radius. https://cdn.kastatic.org/ka-youtube-converted/SLyM_-sQwMM.mp4/SLyM_-sQwMM.mp4 230 Equations of a circle https://www.khanacademy.org/math/geometry/xff63fac4:hs-geo-conic-sections/alg2-graphs-of-circles-intro/e/find-the-features-of-a-circle-from-its-graph 2026-05-11T22:30:48.573944679Z Features of a circle from its graph Given the graph of a circle, find its center and radius. Sid Patel exercise https://www.khanacademy.org/math/geometry/xff63fac4:hs-geo-conic-sections/hs-geo-circle-expanded-equation/v/completing-the-square-to-write-equation-in-standard-form-of-a-circle 2021-04-21T12:01:46Z Features of a circle from its expanded equation Sal finds the center and the radius of a circle whose equation is x^2+y^2+4x-4y-17=0, and then he graphs the circle. Sal Khan video https://cdn.kastatic.org/googleusercontent/Oembzj1tMOVAtpDcNkuVVwyscF4ptsiqRKaW9ns45uBsAFn-r5-Trm7evKb0P-TRqRrjiFNGW55uKvQm5Rlzh049 Features of a circle from its expanded equation Sal finds the center and the radius of a circle whose equation is x^2+y^2+4x-4y-17=0, and then he graphs the circle. https://cdn.kastatic.org/ka-youtube-converted/XyDMsotfJhE.mp4/XyDMsotfJhE.mp4 260 Equations of a circle https://www.khanacademy.org/math/geometry/xff63fac4:hs-geo-conic-sections/hs-geo-circle-expanded-equation/e/equation_of_a_circle_2 2026-03-19T10:29:23.537306434Z Features of a circle from its expanded equation Find the center and radius of a circle given the equation in expanded form. Sid Patel exercise https://www.khanacademy.org/math/geometry/xff63fac4:hs-geo-conic-sections/hs-geo-circle-expanded-equation/e/graphing_circles_2 2026-03-19T10:29:23.537306434Z Graph a circle from its expanded equation Given the expanded equation of a circle, graph the circle. For example, graph the circle whose equation is x²+y²+4x+8y+16=0. Sid Patel exercise https://www.khanacademy.org/math/10th-grade-math-revised-k-to-10-3-terms/x06a77af3c81397cf:second-quarter/x06a77af3c81397cf:equations-of-a-circle/e/v2-circle-equations-1 2023-12-04T17:55:05.230178085Z Circle equations: foundations Circle equations: foundations Duo Yang exercise https://www.khanacademy.org/math/10th-grade-math-revised-k-to-10-3-terms/x06a77af3c81397cf:second-quarter/x06a77af3c81397cf:equations-of-a-circle/e/v2-circle-equations-2 2025-06-26T01:15:39.033799497Z Circle equations: medium Circle equations: medium Duo Yang exercise https://www.khanacademy.org/math/10th-grade-math-revised-k-to-10-3-terms/x06a77af3c81397cf:second-quarter/x06a77af3c81397cf:equations-of-a-circle/e/v2-circle-equations-3 2023-12-04T17:55:05.230178085Z Circle equations: advanced Circle equations: advanced Duo Yang exercise https://www.khanacademy.org/math/geometry/xff63fac4:hs-geo-conic-sections/hs-geo-circle-expanded-equation/a/circle-equation-review 2022-09-10T02:03:40.164764806Z Circle equation review Review the standard and expanded forms of circle equations, and solve problems concerning them. article