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# Geometry Concepts: GED Test Prep

By LearningExpress Editors
LearningExpress, LLC
Updated on Mar 9, 2011

This article reviews the geometry concepts you will need to know for the GED Mathematics Exam. You should become familiar with the properties of angles, lines, polygons, triangles, and circles, as well as the formulas for area, volume, and perimeter. A grasp of coordinate geometry will also be important when you take the GED.

Geometry is the study of shapes and the relationships among them. The geometry you are required to know for the GED Mathematics Exam is fundamental and practical. Basic concepts in geometry will be detailed and applied in this section. The study of geometry always begins with a look at basic vocabulary and concepts. Therefore, here is a list of definitions of important terms.

area—the space inside a two-dimensional figure
bisect—cut in two equal parts
circumference—the distance around a circle
diameter—a line segment that goes directly through the center of a circle (the longest line you can draw in a circle)
equidistant—exactly in the middle of
hypotenuse—the longest leg of a right triangle, always opposite the right angle
line—an infinite collection of points in a straight path
point—a location in space
parallel—lines in the same plane that will never intersect
perimeter—the distance around a figure
perpendicular—two lines that intersect to form 90-degree angles
quadrilateral—any four-sided closed figure
radius—a line from the center of a circle to a point on the circle (half of the diameter)
volume—the space inside a three-dimensional figure

### Angles

An angle is formed by an endpoint, or vertex, and two rays.

### Naming Angles

There are three ways to name an angle.

1. An angle can be named by the vertex when no other angles share the same vertex: A.
2. An angle can be represented by a number written across from the vertex: 1.
3. When more than one angle has the same vertex, three letters are used, with the vertex always being the middle letter: 1 can be written as BAD or as DAB; 2 can be written as DAC or as CAD.

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