The author demonstrates how solving geometric problems amounts to fitting parts together to solve interesting puzzles. Students discover relationships that exist between parallel and perpendicular lines; analyze the characteristics of distinct shapes such as circles, quadrilaterals, and triangles; and learn how geometric principles can solve real-world problems. Titles in Barronas " Painless Series " are written especially for middle school and high school students who are having a difficult time with a specific subject. In many cases, a student is confused by the subjectas complexity and details. Still other students simply finds a subject uninteresting, an attitude that usually results in lower grades. " Painless " titles offer informal, student-friendly approaches to each subject, emphasizing interesting details, supplementing the text with amusing insights, and outlining potential pitfalls clearly and step by step. Students begin to understand how disparate details all fit together to form a clear picture. Timelines, ideas for interesting projects, and aBrain Ticklera quizzes in many of these titles help to take the pain out of study and improve each studentas grades.