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 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 2025-10-01T17:00:46.216593062Z 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-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 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/geometry/xff63fac4:hs-geo-conic-sections/hs-geo-circle-standard-equation/v/writing-standard-equation-of-circle 2022-10-07T00:00:24.225559754Z Writing standard equation of a circle Given a circle on the coordinate plane, Sal finds its standard equation, which is an equation in the form (x-a)²+(y-b)²=r². video https://cdn.kastatic.org/ka_thumbnails_cache/e02a9a45-7965-4d42-be70-a6f4d2bd2c79_1280_720_base.png Writing standard equation of a circle Given a circle on the coordinate plane, Sal finds its standard equation, which is an equation in the form (x-a)²+(y-b)²=r². https://cdn.kastatic.org/ka-youtube-converted/iX5UgArMyiI.mp4/iX5UgArMyiI.mp4 340 Circle https://www.khanacademy.org/math/geometry/xff63fac4:hs-geo-conic-sections/hs-geo-circle-standard-equation/e/write-the-equation-of-a-circle 2025-12-19T21:33:42.208123804Z Write standard equation of a circle Given the graph of a circle or its features, find its standard equation. 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 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/ka-math-class-11/x0419e5b3b578592a:conic-sections-ncert-new/x0419e5b3b578592a:circle/v/equation-of-circle-whose-centre-lies-on-a-given-line 2025-06-01T03:41:19.129224051Z Equation of circle whose centre lies on a given line In this video, we learn how to find the equation of a circle when its centre lies on a given line and it passes through two given points. We'll set up equations using the standard circle formula and the given line equation to solve for the centre and radius. We also tackle a problem where the circle's radius is known, its centre is on the x-axis, and it passes through a specific point. Ashish Gupta video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Equation of circle whose centre lies on a given line In this video, we learn how to find the equation of a circle when its centre lies on a given line and it passes through two given points. We'll set up equations using the standard circle formula and the given line equation to solve for the centre and radius. We also tackle a problem where the circle's radius is known, its centre is on the x-axis, and it passes through a specific point. https://cdn.kastatic.org/ka-youtube-converted/7Y8hD4q-C_Y.mp4/7Y8hD4q-C_Y.mp4 578 Circle https://www.khanacademy.org/math/ka-math-class-11/x0419e5b3b578592a:conic-sections-ncert-new/x0419e5b3b578592a:circle/e/equation-of-circle-whose-centre-lies-on-a-given-line 2025-08-08T02:53:40.009522544Z Equation of circle whose centre lies on a given line Equation of circle whose centre lies on a given line Ashish Gupta exercise https://www.khanacademy.org/math/ka-math-class-11/x0419e5b3b578592a:conic-sections-ncert-new/x0419e5b3b578592a:circle/v/finding-equation-of-a-circle-application-based 2025-06-01T03:41:19.129224051Z Finding equation of a circle (application based) This video covers various application-based problems for finding the equation of a circle or determining properties. We'll check if a point lies inside, outside, or on a given circle. We'll also find the equation of a circle given its centre and a point it passes through. Finally, we derive the equation of a circle that passes through the origin and makes specific intercepts on the coordinate axes. Ashish Gupta video https://cdn.kastatic.org/googleusercontent/ZCdwTudJg6e6n-P2gsaUborP4izvMsGo71pvEVlX9dNYWcLXcP7VHkWpn2grt4TUP1KoJLQP9NswyHBuBLSFTBw Finding equation of a circle (application based) This video covers various application-based problems for finding the equation of a circle or determining properties. We'll check if a point lies inside, outside, or on a given circle. We'll also find the equation of a circle given its centre and a point it passes through. Finally, we derive the equation of a circle that passes through the origin and makes specific intercepts on the coordinate axes. https://cdn.kastatic.org/ka-youtube-converted/dQyXAiPhQS4.mp4/dQyXAiPhQS4.mp4 372 Circle 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