# Descriptive Geometry/Understanding Views

Descriptive geometry's primary function is to translate an object in three dimensions into a two dimensional representation of that object. Each such representation is called a view.

## From Two Dimensions to One

Rather than begin with views of three dimensional objects, we shall first examine the process of taking one-dimensional views of a two-dimensional figure. Suppose that we have a square, rotated at an angle relative to the angle of the two views we will be taking of it.

## Point View

Point view of a line shows a view of a line in which its endpoints coincide. To find point view of a line you must first find it in true length if you have not already done so (the construction for finding true length of a line is described in the following section, True Length). Then you must take a view perpendicular to the true length line, and that will give you the line in point view.

## True Length

Finding the true length is a fundamental process in descriptive geometry that advances the problem-solving to the next steps to reach the solution. To find the true length of a line you must take a view parallel to the line; in other words, if a line is a parallel to the folding line in one view, it is shown in true length in the adjacent view. If a line is parallel to the folding line in both adjacent views, as for example in both the top and front views, then it is shown in true length in both of those views, and in such cases no additional work must be done if the only goal is to find the true length of the line.