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Геометрические фигуры

Circle. A circle is a closed curve with constant curvature. The distance from the center to the border is constant, no matter where the point is on the border. Technically speaking, a "circle" refers to the curved boundary, while a "disk" is a circle plus its interior. In everyday life, the two terms can be used interchangeably.

Ellipse. An ellipse is a circle squished (or stretched) in one direction. If you cut a cone or a cylinder at an angle, the cross-section is an ellipse. An ellipse has two foci with the following property. For any triangle you draw that connects the two foci and an arbitrary point on the ellipse’s border, the perimeter of the triangle is constant. A circle is a special type of ellipse in which the two foci coincide at the same point.

Stadium.A stadium is an oblong figure formed by joining semicircles to opposite ends of a rectangle. It gets its name from the shape of sport fields.

Oval. An oval is a non-specific term for any sort of closed oblong or egg-shaped curve without points. It includes ellipses, stadiums and more irregular egg-shaped curves.

Arch. An arch is a shape with one curved arc opposite a straight edge. It may have more than one straight side.

Circular Sector. A circular sector is a wedge or pie slice cut from a circle. The vertex of a circular sector is the center of the circle from which it is cut.

Circular Segment.A circular segment is formed by cutting a circle along a chord. It is a two-sided shape, with one side curved and the other side straight. Arches can be shaped like circular segments

Lens.A lens is a two-sided figure formed from two arcs; both arcs are convex with respect to the interior of the figure. It has two vertices where the arcs meet.

Crescent.A crescent is a two-sided figure formed from two arcs; one curved side is convex with respect to the interior and the other is concave. It can be formed by taking a disk and removing a smaller disk along the edge.

Annulus.An annulus is a ring. It is formed by taking a disk and removing a smaller disk from the center.

Circles, ellipses, stadiums, and ovals.

Arches, sectors, segments, lenses, annuluses, and crescents.

Читайте також:

1. Внедренные объекты: рисунки и автофигуры
2. Плоскопараллельное перемещение – это такое перемещение геометрической фигуры в пространстве, когда все ее точки двигаются в плоскостях, параллельных какой-либо плоскости проекций.

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