Painless geometry (2nd ed)

The author demonstrates how solving geometric problems amounts to fitting parts together to solve interesting puzzles.

This book helps students discover relationships that exist between parallel and perpendicular lines; analyse the characteristics of distinct shapes such as circles, quadrilaterals, and triangles; and learn how geometric principles can solve real-world problems. "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 Brain Tickler quizzes in many of these titles help to take the tedium out of study and improve each student's grades.