Point - a dot on a page. A point has no dimensions (length, width, height), it is usually represent by a capital letter and a dot on a page. Think of it as an infinitely small place or position on a map.
Line - an unlimited number of points along the same path. The set of points may be straight or form a curve. Normally, the term 'line' means a straight line. The 'line' has no dimensions (length, width, height) and extends unlimited in both directions.
(The part of a line defined by two points, called 'endpoints', is call a line segment or 'segment'.)A 'line' is represented by a drawn line with arrowheads on each end to represent that it doesn't have endpoints. A line can be named in two ways: (1) use the capital letters representing two points on the line and place a double-headed arrow above the two letters (2) use a lowercase letter beside the line to represent it. Plane - a flat surface that extends indefinitely in all directions. It is usually represented by a parallelogram (four sided figure) with a capital letter in one corner.
Remember the plane is not limited by the parallelogram, it extends infinitely. The plane can also be represented by using three points that lie on the plane surface but not on the same line (noncollinear).The line, itself, is a subset (though not a proper subset). A ray is a subset of a line with one end-point which extends in only one direction. A line segment is a subset of a line with two end points. A point is a subset of a line.
Finally, nothing is a subset (the null subset) of a line. in geometry , a shape consist of a planes, and any plane consist of a connection of planes, and any break down lines, you can then subsets line segments and rays by learning about the line and its subsets.In geometry, an angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle. Angle is also used to designate the measure of an angle or of a rotation. This measure is the ratio of the length of a circular arc to its radius.
In the case of a geometric angle, the arc is centered at the vertex and delimited by the sides. In the case of a rotation, the arc is centered at the center of the rotation and delimited by any other point and its image by the rotation.Geometry in composition1. The leading lineA leading line does what it says: it leads the eye from one part of the picture to another: from the foreground to the background, the secondary subject to the main subject (but very rarely the other way round).
The leading line adds motion to an otherwise static picture and ties different elements in it together. Diagonals and arcs or other unclosed curves make good leading lines.2. The spatial dividerA spatial divider divides the picture into discrete areas, which work together to make the composition. Not all pictures are based on areas, but sometimes areas can make for a strong composition even in the absence of clear points of interest.
Triangles are particularly useful as spatial dividers, but other elements (diagonals, open curves) can perform the role as well.3. The framing elementA framing element serves to focus attention on the main subject. It usually covers at least two edges of the picture and can intrude a good way into it, sometimes taking up most of the space in it.
For this to work, the framing element has to have some interesting characteristics of its own: color, texture, or shape. Bold, geometric shapes can work very well as framing elements: triangles or arcs work especially well. Usually, framing elements should be lower-key and more muted than the main subject: they are not meant to distract, but to focus, even when the actual point of the picture is the framing element, such as with some of the Phony Subject examples.A 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 is denoted ABC.the secondary parts are at the bottom.the secondary parts of the trianglemedian - a segment whose endpoints are a vertex of the triangle and the midpoint of the opposite sideangle bisector - a segment which bisects an angle and whose endpoints are a vertex of the triangle and a point on the opposite sidealtitude - a segment from the vertex of the triangle perpendicular to the line containing the opposite sideperpendicular bisector - a line whose points are equidistant from the endpoints of the given side.
