Properties+and+Shapes




 * Properties and Shapes **

All elements in the whole world has a shape and some properties, in particular there are some types of shapes that are like the essentials, these shapes are the ones in which provide all other shapes, forms and structures in the whole world.

According to the dictionary, shape can be defined as follows:


 * ** A ** |||||||| //noun// ||
 * || **1** |||||| **shape**, form ||
 * ||  || //the spatial arrangement of something as distinct from its substance; "geometry is the mathematical science of shape"// ||


 * || **2** |||||| form, **shape**, cast ||
 * ||  || //the visual appearance of something or someone; "the delicate cast of his features"// ||


 * || **3** |||||| **shape**, form, configuration, contour, conformation ||
 * ||  || //any spatial attributes (especially as defined by outline); "he could barely make out their shapes through the smoke"// ||

**Basics 2D shapes:**

**Square:** In geometry, a **square** is a regular polygon quadrangular. This means that it has four equal sides and four equal angles (90 degree angles, or right angles). A square with vertices ABCD would be denoted //ABCD//.
 * Triangle:** is one of the basic shapes of geometry: a polygon with three corners or vertices and three sides or edges which are line segments. A triangle with vertices //A//, //B//, and //C// is denoted [[image:http://upload.wikimedia.org/math/f/5/d/f5d889f32d6794e1bc2ed394e9688c76.png]] //ABC//.
 * In** **Euclidean geometry** **any three non-****collinear** **points determine a unique triangle and a unique** **plane** **(i.e. a two-dimensional** **Euclidean space****).**



**Circle**: is a simple shape of Euclidean geometry consisting of those points in a plane which are equidistant from a given point called the //center//. The common distance of the points of a circle from its center is called its //radius.// Circles are simple closed curves which divide the plane into two regions, an interior and an exterior. In everyday use, the term "circle" may be used interchangeably to refer to either the boundary of the figure (known as the //perimeter//) or to the whole figure including its interior. However, in strict technical usage, "circle" refers to the perimeter while the interior of the circle is called a //disk//. The //circumference// of a circle is the perimeter of the circle (especially when referring to its length). A circle is a special ellipse in which the two foci are coincident. Circles are conic sections attained when a right circular cone is intersected with a plane perpendicular to the axis of the cone.