I'm using it right now in 10th grade (my school does Algebra 2 in 9th grade) and I love this book because it is easy to understand, gives definitions in a simple manner and plenty of examples with answers. The problem sets are at most 30 problems (which is great for homework in comparison to the 40-100 problems I got last year) and some of the odd answers are available in the back to check your work! The chapters are well divided and give you enough info for you to digest it all and enjoy geometry. I'm sure the challenge will come in later chapters :)
Geometry for Enjoyment and Challenge is the go-to book for high school level geometry. With 16 chapters, this textbook is utilized in most high school classrooms as the syllabus, incorporating notes and questions from it within the class curriculum. It goes through all the major and minor concepts of the course, from an intro of geometry and proofs to geometric constructions and inequalities. For those going through geometry in school or those who wish to get a headstart, this is the textbook for you that meets all your needs.
Personally, I liked this textbook more than the other textbooks I’ve used in school. Through easy to understand diagrams and pictures along with thorough yet understandable explanations, the book prepared me very well. The class is a hard one, but the textbook makes it a lot easier for you if you take the time to go through it. One of the main reasons for this is because of the large amount of example problems and answers it shows you in the notes sections of the book. They don’t just put information in front of you, they back it up and help you understand it through a large amount of examples. Furthermore, there are a good amount of work problems for you to do on your own that are split into three difficulties (A, B, and C) which you can solve and then check in the back to see if you did them correctly. Overall, I felt like this textbook prepared me more for my math class than any other ones I have used.
The best geometry book out there. I recommend this as an honors geometry prep course and a college prep course if one wants to major in computer science, engineering, economics or math related. The proofs are rigorous and tedious, with several examples.