A circle viewed from a side angle looks like an ellipse: that is, the ellipse is the image of a circle under parallel or perspective projection. The ellipse is also the simplest Lissajous figure formed when the horizontal and vertical motions are sinusoids with the same frequency: a similar effect leads to elliptical polarization of light in ...

Wikipedia®和维基百科标志是维基媒体基金会的注册商标；维基™是维基媒体基金会的商标。 维基媒体基金会是按美国国內稅收法501(c)(3)登记的非营利慈善机构。 隐私政策; 关于维基百科; 免责声明; 行为准则; 开发者; 统计; Cookie声明; 手机版视图

Eine Ellipse ist der geometrische Ort aller Punkte der Ebene, für die die Summe der Abstände zu zwei gegebenen Punkten und gleich einer gegebenen Konstante ist. Diese Konstante wird üblicherweise mit bezeichnet.

In geometry, an ellipse is a plane curve which results from the intersection of a cone by a plane in a way that produces a closed curve. Circles are special cases of ellipses, created when the cutting plane is perpendicular to the cone's axis.

An ellipse has two axes and two foci. Unlike most other elementary shapes, such as the circle and square, there is no algebraic equation to determine the perimeter of an ellipse. Throughout history, a large number of equations for approximations and estimates have been made for the perimeter of an ellipse.

2012年4月24日 · An ellipse is a planar curve obtained by the intersection of a circular cone with a plane not passing through the vertex of the cone and intersecting all its generators in points of one of its sheets.

2025年1月31日 · The ellipse is a conic section and a Lissajous curve. An ellipse can be specified in the Wolfram Language using Circle[x, y, a, b]. If the endpoints of a segment are moved along two intersecting lines, a fixed point on the segment (or on the line that prolongs it) describes an arc of an ellipse.

The general ellipsoid, also known as triaxial ellipsoid, is a quadratic surface which is defined in Cartesian coordinates as: + + =, where , and are the length of the semi-axes.. The points (,,), (,,) and (,,) lie on the surface. The line segments from the origin to these points are called the principal semi-axes of the ellipsoid, because a, b, c are half the length of the principal axes.

An ellipse is the locus of a point whose sum of distances from two fixed points is a constant. Its equation is of the form x^2/a^2 + y^2/b^2 = 1, where 'a' is the length of the semi-major axis and 'b' is the length of the semi-minor axis.

In geometry, an ellipse is a plane curve which results from the intersection of a cone by a plane in a way that produces a closed curve. Circles are special cases of ellipses, obtained when the...