ELEMENTARY GEOMETRY FOR COLLEGE STUDENTS, 7th Edition, is designed to help students develop a comprehensive vocabulary of geometry, an intuitive and inductive approach to the development of principles, and strong deductive skills to solve geometrybased realworld applications. Over 150 new exercises provide additional practice in writing proofs. Available with access to WebAssign, an online study tool that helps students master the course concepts.
P. Preliminary Concepts.
Sets and Geometry. Statements and Reasoning. Informal Geometry and Measurement. PERSPECTIVE ON HISTORY: Our Greek Heritage. PERSPECTIVE ON APPLICATION: ONETOONE Correspondence. Summary Review Exercises Chapter Test.
1. Line and Angle Relationships.
Early Definitions and Postulates. Angles and Their Relationships. Introduction to Geometric Proof. Relationships: Perpendicular Lines. The Formal Proof of a Theorem. PERSPECTIVE ON HISTORY: The Development of Geometry. PERSPECTIVE ON APPLICATION: Patterns. Summary Review Exercises Chapter Test.
2. Parallel Lines.
The Parallel Postulate and Special Angles. Indirect Proof. Proving Lines Parallel. The Angles of a Triangle. Convex Polygons. Symmetry and Transformations. PERSPECTIVE ON HISTORY: Sketch of Euclid. PERSPECTIVE ON APPLICATION: NonEuclidean Geometries. Summary Review Exercises Chapter Test.
3. Triangles.
Congruent Triangles. Corresponding Parts of Congruent Triangles. Isosceles Triangles. Basic Constructions Justified. Inequalities in a Triangle. PERSPECTIVE ON HISTORY: Sketch of Archimedes. PERSPECTIVE ON APPLICATION: Pascal's Triangle. Summary Review Exercises Chapter Test.
4. Quadrilaterals.
Properties of a Parallelogram. The Parallelogram and Kite. The Rectangle, Square, and Rhombus. The Trapezoid. PERSPECTIVE ON HISTORY: Sketch of Thales. PERSPECTIVE ON APPLICATION: Square Numbers as Sums. Summary Review Exercises Chapter Test.
5. Similar Triangles.
Ratios, Rates and Proportions. Similar Polygons. Proving Triangles Similar. The Pythagorean Theory. Special Right Triangles. Segments Divided Proportionally. PERSPECTIVE ON HISTORY: Ceva's Proof. PERSPECTIVE ON APPLICATION: An Unusual Application of Similar Triangles. Summary Review Exercises Chapter Test.
6. Circles.
Circles and Related Segments and Angles. More Angle Measures in the Circle. Line and Segment Relationships in the Circle. Some Construction and Inequalities in the Circle. PERSPECTIVE ON HISTORY: Circumference of the Earth. PERSPECTIVE ON APPLICATION: Sum of the Interior Angles of a Polygon. Summary Review Exercises Chapter Test.
7. Locus and Concurrence.
Locus of Points. Concurrence of Lines. More About Regular Polygons. PERSPECTIVE ON HISTORY: The Value of π (Pi). PERSPECTIVE ON APPLICATION: The NinePoint Circle. Summary Review Exercises Chapter Test.
8. Areas of Polygons and Circles.
Areas and Initial Postulates. Perimeter and Area of Polygons. Regular Polygons and Area. Circumference and Area of a Circle. More Area Relationships in the Circle. PERSPECTIVE ON HISTORY: Sketch of Pythagoras. PERSPECTIVE ON APPLICATION: Another Look at the Pythagorean Theorem. Summary Review Exercises Chapter Test.
9. Surfaces and Solids.
Prisms, Area, and Volume. Pyramids, Area, and Volume. Cylinders and Cones. Polyhedrons and Spheres. PERSPECTIVE ON HISTORY: Sketch of René Descartes. PERSPECTIVE ON APPLICATION: Birds in Flight. Summary Review Exercises Chapter Test.
10. Analytical Geometry.
The Rectangular Coordinate System. Graphs of Linear Equations and Slope. Preparing to do Analytic Proofs. Analytic Proofs. Equations of Lines. A ThreeDimensional Coordinate System. PERSPECTIVE ON HISTORY: The BanachTarski Paradox. PERSPECTIVE ON APPLICATION: The PointofDivision Formulas. Summary Review Exercises Chapter Test.
11. Introduction to Trigonometry.
The Sine Ratio and Applications. The Cosine Ratio and Applications. The Tangent Ratio and Other Ratios. Applications with Acute Triangles. PERSPECTIVE ON HISTORY: Sketch of Plato. PERSPECTIVE ON APPLICATION: Radian Measure of Angles. Summary Review Exercises Chapter Test.
Appendix A: Algebra Review.
Appendix B: Summaries of Constructions, Postulates, Theorems, and Corollaries
Answers.
Glossary.
Index.

Daniel C. Alexander
Daniel C. Alexander is professor emeritus of mathematics at Parkland College in Champaign, Illinois. Before retiring, Professor Alexander taught mathematics at the secondary and college levels for over 40 years. He was a member and officer of IMACC, a member of AMATYC, and remains a member of ICTM. In addition to presenting and participating in panel discussions at these conferences, Professor Alexander has published numerous articles in the ICTM, NCTM and AMATYC mathematics journals. Professor Alexander holds undergraduate and graduate degrees from Southern Illinois University, and completed considerable postgraduate course work as well.

Geralyn M. Koeberlein
Before her retirement, Geralyn M. Koeberlein taught mathematics at MahometSeymour High School in Mahomet, Illinois, for 34 years. She taught several levels of math, from Algebra I to AB Calculus, and spent the last few years of her career as chair of the Math and Science Department. After receiving her Master's Degree from the University of Illinois early in her teaching years, Geralyn continued her education by receiving over 90 hours of postgraduate credit. She is a former member of the ICTM and the NCTM.

Access to the new online WebAssign helps students master geometry concepts and proofs, while instructors can customize assignments and assessments.

A new preliminary Chapter P, includes an introduction to set concepts and formal reasoning to ensure students are prepared for the study of geometry and proofs.

Revised exercise sets with the addition of 150 new exercises provide new authentic problems and proofs for students to practice writing proofs.

Expanded coverage of numerous topics throughout the textincluding point paths, overlapping congruent triangles, and increased focus on continuity and discontinuity in geometric figures, and the congruence of quadrilaterals provide students more focus in these areas enabling them to more fully understand the concepts.

Select paragraphs have been rewritten to provide greater clarification and breadth.

New examples throughout the text help facilitate the understanding of specific concepts, while other new examples provide smoother transitions within a given section and better prepare students for the exercise set that follows.

Real world applicationssuch as checking for the squareness of the opening of a patio door, determining the ideal viewerdistance to TV sets of various screen sizes, checking for accuracy in the construction of a garden gazebo and the application of drywall in new construction or remodelingallow students opportunities to practice what they're learning and help them understand how geometry relates to the world around them. In addition, "Geometry in Nature" and "Geometry in the Real World" boxes emphasize examples of geometry found in everyday life.

Overview tables at the end of each chapter organize important properties, theorems, and figures by providing visual connections between figures and concepts thereby helping students better assess their level of mastery and test readiness.

An Index of Applications calls attention to the practical applications of geometry.

Warnings are provided throughout so that students can avoid common pitfalls when studying geometry.

"Perspective on History" features provide the development of geometry, and "Perspective on Applications" features provide demonstrations of geometry in practice.

Chapter Summaries review the chapter, provide a list of important concepts found in the current chapter, and preview the chapter to follow.

Chapter Reviews and Tests provide numerous practice problems and tests for each chapter.

The Student Study Guide exercise sets, with crossreferences to the text, offer additional practice and review.

Proofs include twocolumn proofs, paragraph proofs, and picture proofs. Students first follow proofs, then fill in missing statements and reasons, then learn to write lowlevel and highlevel proofs.

Technologyrelated margin features encourage the use of the Geometer’s Sketchpad, graphing calculators and further explorations using geometry software.

Reminder boxes found in the margin serve as convenient recall mechanisms for previous content.

"Discover!" activities emphasize induction in the development of geometry, teaching students how to draw general conclusions from specific observations.

Reminders [TEAM: REMINDERS ABOUT WHAT? PREVIOUS RULES? TECHNIQUES? APPROACHES? OTHER?] found in the margin serve as a convenient recall mechanism for previous theorems.

"Discover!" activities emphasize induction in the development of geometry, teaching students how to draw conclusions from observations. [WHICH PROVIDES WHAT BENEFIT?]
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