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 20.1 A Basic Review of the Basics 20.2 A Note on Notation 20.3 Angles and Lines 20.4 Triangles 20.5 Polygons

 20.6 Circles 20.7 Solid As A Rock 20.8 Geometric Visualizations 20.9 Coordinate Geometry
A Basic Review of the Basics
Here’s a quick review of the fundamental concepts and ideas of geometry. SAT questions assume you know these topics and will throw around basic geometry jargon, so you need to have the fundamentals down pat.
Points
A point is a way to describe a specific location in space. Below, the point B is pictured. Isn’t it lovely?
A point has no length or width. Though in the picture, point B is a black dot, in real life points take up no space. Points are useful for identifying specific locations but are not objects in themselves. They only appear as objects when drawn on a page.
Lines
A line is an infinite set of points assembled in a straight formation. A line has no thickness but is infinitely long in both directions. To form a line, take any two points, A and B, and draw a straight line through them. The resulting line is a called line AB.
A line can be drawn through any two points.
Line Segments
A line segment is the portion of a line that lies between two points on that line—in this example, the portion between points A and B make up a line segment. Whereas a line has infinite length, a line segment has a finite length. A line segment is named by the two points it lies between
A line segment can be drawn between any two points.
Rays
Imagine a line and a line segment mating. The result is a ray, a cross between a line and a line segment. It extends infinitely in one direction but not the other.
A ray is named by its endpoint and another point that it passes through.
Okay. Painless basic geometric knowledge: acquired. That was quick. Now on to the real meat and potatoes of the geometry that the new SAT tests.
 Jump to a New ChapterIntroductionThe Discipline of DisciplineSAT StrategiesThe SAT Personal TrainerMeet the Writing SectionBeat the EssayBeat Improving SentencesBeat Identifying Sentence ErrorsBeat Improving ParagraphsMeet the Critical Reading sectionBeat Sentence CompletionsReading Passages: The Long and Short of ItThe Long of ItThe Short of ItSAT VocabularyMeet the Math SectionBeat Multiple-Choice and Grid-InsNumbers and OperationsAlgebraGeometryData, Statistics, and Probability
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