https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:conics/x9e81a4f98389efdf:ellipse-center-radii/v/conic-sections-intro-to-ellipses 2023-07-27T01:47:53.920337803Z Intro to ellipses Learn all about ellipses in this video. The standard form for an ellipse centered at the origin is x²/a² + y²/b² = 1. The semi-major axis is the longest radius and the semi-minor axis is the shortest radius. The video also explains how to shift an ellipse. Sal Khan video https://cdn.kastatic.org/googleusercontent/D5XS31KtD3HUL7SHsmzd_JIMx34-i0GpaT_aO8lkQ9ZJ-xQh8o_aqjYRbOoOi1pxn3PrusQB7Bl6CSkBWjBjmBHT Intro to ellipses Learn all about ellipses in this video. The standard form for an ellipse centered at the origin is x²/a² + y²/b² = 1. The semi-major axis is the longest radius and the semi-minor axis is the shortest radius. The video also explains how to shift an ellipse. https://cdn.kastatic.org/ka-youtube-converted/lvAYFUIEpFI.mp4/lvAYFUIEpFI.mp4 854 Center and radii of an ellipse https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:conics/x9e81a4f98389efdf:ellipse-center-radii/e/center-and-radii-of-an-ellipse-and-its-graph 2026-04-08T00:16:02.937952483Z Graph & features of ellipses Find the center and radii of an ellipse from its graph, and vice versa. Sid Patel exercise https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:conics/x9e81a4f98389efdf:ellipse-center-radii/e/equation_of_an_ellipse 2025-03-01T15:52:37.13987578Z Center & radii of ellipses from equation Find the center and major and minor radius of an ellipse given its equation. Sid Patel exercise https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:conics/x9e81a4f98389efdf:ellipse-center-radii/a/ellipse-features-review 2024-10-16T19:37:28.253855216Z Ellipse features review Review all the features of an ellipse: center, vertices, co-vertices, major radius, minor radius, and foci. article https://www.khanacademy.org/math/precalculus/x9e81a4f98389efdf:conics/x9e81a4f98389efdf:ellipse-center-radii/a/ellipse-equation-review 2024-10-16T19:37:28.253855216Z Ellipse equation review Review your knowledge of ellipse equations and their features: center, radii, and foci. article