Free delivery on all orders above RM80 to Malaysia
Get 10% off all year round! Join Thryft Club

Your cart

Your cart is empty

Check out these collections!

Bestselling Fiction
Bestselling Nonfiction
Bestselling Books for Children
Vintage and Rare Books
Vinyl Records
Women's Clothing
Men's Clothing

Stay in touch and win free books

Keep up with our latest sales and events, and receive
recommendations direct to your inbox. We'll only send the good stuff, promise!

By completing this form, you are signing up to receive our emails and can unsubscribe at any time

Secrets of Triangles: A Mathematical Journey

by Ingmar Lehmann, Alfred S. Posamentier
Secrets of Triangles: A Mathematical Journey
Secrets of Triangles: A Mathematical Journey

Triangle puzzles that make geometry feel magical

This is a lovely pick if you enjoy seeing familiar school maths suddenly turn surprising and elegant. It takes something as ordinary as triangles and reveals hidden patterns, clever constructions, and little mathematical wonders that feel genuinely satisfying to uncover. Because it stays clear and approachable, it’s especially rewarding for curious readers who want maths to feel playful, visual, and smart rather than intimidating.

Note: While we do our best to ensure the accuracy of cover images, ISBNs may at times be reused for different editions of the same title which may hence appear as a different cover.

Secrets of Triangles: A Mathematical Journey

by Ingmar Lehmann, Alfred S. Posamentier
Condition guide

Book Condition Guide

Books in Like New Condition

This book may contain very minor cosmetic defects, but it is in pristine condition. There should be no yellowing, no foxing, no water damage, and no annotations of any kind on the cover and the pages. For paperbacks, there should not be any crease marks on the spine. This book is good as new — lucky you!

*Books may be missing bundle media (e.g. CD, e-book code), if included.

Books in Very Good Condition

This book has been used, but it is still in a clean condition. There should be no foxing or annotations of any kind on the inner pages, but a sparse amount may be present on the cover, title pages, or outside edges of the book. There should be no water damage of any kind. For paperbacks, there may be light crease marks on the spine.

*Books may be missing bundle media (e.g. CD, e-book code), if included.

Books in Good Condition

We do our best to ensure the quality of our books, but there is no escaping the wear and tear that comes with time. Slight foxing and some annotations may be present on the pages and the cover. There should be no water damage of any kind. For paperbacks, there may be several crease marks on the spine.

*Books may be missing bundle media (e.g. CD, e-book code), if included.

Books in Well Read Condition

This is a well-read book, which means that the previous owner probably really enjoyed it! The cover and pages may include moderate foxing and annotations, but the text is not obscured and still readable. Moderate cosmetic defects and minor water damage may be present on the edges of the book. For paperbacks, there may be multiple crease marks on the spine.

*Books may be missing bundle media (e.g. CD, e-book code), if included.

 

Find out more about our process here.

Save 10% On This Item as a Thryft Club Member

Join Thryft Club for S$30/year and enjoy 10% off everything, plus S$10 off your first order. Join now →

ISBN: 9781616145873
Authors: Ingmar Lehmann, Alfred S. Posamentier
Publisher: Prometheus
Date of Publication: 2012-08-24
Format: Hardcover
Related Collections: Science, Personal Development
Related Topics: Education, Mathematics, How To
Goodreads rating: 4.18
(rated by 28 readers)

Description

Everyone knows what a triangle is, yet very few people appreciate that the common three-sided figure holds many intriguing "secrets." For example, if a circle is inscribed in any random triangle and then three lines are drawn from the three points of tangency to the opposite vertices of the triangle, these lines will always meet at a common point - no matter what the shape of the triangle. This and many more interesting geometrical properties are revealed in this entertaining and illuminating book about geometry. Flying in the face of the common impression that mathematics is usually dry and intimidating, this book proves that this sometimes-daunting, abstract discipline can be both fun and intellectually stimulating. The authors, two veteran math educators, explore the multitude of surprising relationships connected with triangles and show some clever approaches to constructing triangles using a straightedge and a compass. Readers will learn how they can improve their problem-solving skills by performing these triangle constructions. The lines, points, and circles related to triangles harbor countless surprising relationships that are presented here in a very engaging fashion. Requiring no more than a knowledge of high school mathematics and written in clear and accessible language, this book will give all readers a new insight into some of the most enjoyable and fascinating aspects of geometry.
 

Triangle puzzles that make geometry feel magical

This is a lovely pick if you enjoy seeing familiar school maths suddenly turn surprising and elegant. It takes something as ordinary as triangles and reveals hidden patterns, clever constructions, and little mathematical wonders that feel genuinely satisfying to uncover. Because it stays clear and approachable, it’s especially rewarding for curious readers who want maths to feel playful, visual, and smart rather than intimidating.

Note: While we do our best to ensure the accuracy of cover images, ISBNs may at times be reused for different editions of the same title which may hence appear as a different cover.