A closed curve that is formed when a cylindrical shape is intersected by a plane at an angle, characterized by the sum of the distances from two fixed points being constant. Often referred to as a long oval shape in geometry.
A geometric figure that serves as a two-dimensional representation, defined by its unique relationship to two focal points, making it distinct from other shapes.
A special type of conic section that can also describe the three-dimensional form created when this figure is rotated around its longer axis, exemplifying physical objects like rugby balls.
A geometric shape that resembles a flattened circle, characterized by its elongated form and symmetrical curvature.
A shape that is defined by its two focal points, where the sum of the distances from any point on the boundary to the two points remains constant.
A rounded figure that is wider along one axis than the other, often likened to the shape of an egg or a flattened sphere.
Example:
シリウスを回る軌道は楕円形である。