A polygon, a name derived from Greek meaning many-angled, is a plane geometric figure bounded by three or more sides. Common examples of polygons are triangle, quadrilateral, pentagon and hexagon. All polygons have vertices, which are the angle points where two sides meet. Thus, the number of sides indicates the same number of vertices of a polygon. For example, a four-sided quadrilateral would have four vertices. Similarly, a n-sided polygon would have n vertices.
Two-dimensional figure is enclosed by straight lines or curves. Various types geometrical shape such as square, rectangle, equilateral triangle, and circle. A triangle has three sides. A quadrilateral has four sides. Figures with round shapes are called circles, and have curved side. A square has four sides equal in length.
Three-dimensional geometric figures such as cube, cuboids, pyramid, sphere, cylinder and cone. Four sides of a cube are equal. Length, width and height of cuboids are different. Cone has a base of a circle. Pyramid has a square base. Pyramid with base of a rectangle. Cylinder has a circled base. Sphere with shape of a ball.
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