Geometry is a mathematical field that deals with shapes and measures. In this chapter we introduce the basics of geometry. These basics include points, lines, and planes.
A point is an object without shape of size. Points are commonly used to describe a location or a position. A line is a one-dimensional object of infinite length. A line has no width and does not have any bends. A plane is two-dimensional, it has infinite width and infinite length but no thickness of height.
Angles are classified by what measure they have. Acute angles have a measure less than 90 degrees and obtuse angels have a measure greater than 90 degrees but less than 180 degrees. An angle with a measure of exactly 90 degrees is a right angle and an angle with a measure of exactly 180 degrees is a straight angle.
Points, lines and planes can be used to construct a large number of other geometric objects. In this chapter objects such as angles, line segments, and rays will be explored.
When two points have been defined in a plane it is possible to define the distance between the points and the midpoint between the points. Formulas for determining the distance between two points and a formula for finding the midpoint are presented in this chapter.
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Subchapters:

• Defining and Constructing Objects
• Using Midpoint and Distance Formulas
• Describing Angles