Geometric Problems on Maxima and Minima

From the reviews:

"As an avid problem solver with a strong interest in inequalities…I am delighted to supplement my repertoire with the techniques illustrated in this volume…. The book contains hundreds of problems, classical and modern, all with hints or complete solutions…. Over the years, Titu Andreescu and various collaborators have used their experiences as teachers and as Olympiad coaches to produce a series of excellent problem-solving manuals…. The present volume continues that tradition and should appeal to a wide audience ranging from advanced high school students to professional mathematicians."  
–MAA

"The whole exposition of the book is kept at a sufficiently elementary level, so that it can be understood by high-school students. Apart from trying to be comprehensive in terms of types of problems and techniques for their solutions, the authors have tried to offer various different levels of difficulty making the book possible to use by people with different interests in mathematics, different abilities, and of different age groups." —V. Oproiu,
Analele Stiintifice

"This excellent book, Geometric problems on maxima and minima, deals not only with these famous problems, but well over a hundred other such problems, many of which were completely novel and new to me. ... This book will certainly greatly appeal to highschool students, mathematics teachers, professional mathematicians, and puzzle enthusiasts. I would regard it as absolutely essential reading for students preparing for mathematics competitions around the world." (Michael de Villiers, The Mathematical Gazette, Vol. 92 (525), 2008)