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Geometry Snacks, Ages 8-18
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Table of Contents

1. What fraction is shaded? 2. Find the missing angle 3. What is the area? 4. Prove it 5. Sangaku

About the Author

Ed Southall is a teacher trainer at Huddersfield University in the UK, and the author of "Yes But Why? Teaching for Understanding in Mathematics". Ed has taught mathematics for 14 years in secondary schools both in the UK and the Middle East. He has developed a large following online as @solvemymaths on twitter where he regularly posts mathematical puzzles. Vincent Pantaloni is a French mathematics high school teacher since 2000. He teaches in Orleans in French but also in English to the European and International Sections. With these students he has developed a teaching based on cooperative problem solving. He believes that searching and sharing strategies for complex problems in teamwork helps students in building a stronger mathematical knowledge. He is also a teacher trainer specialised in the use of new technologies and flipped classroom and a member of different research groups. He posts about mathematics on twitter @panlepan and in French on his website Mathzani.

Reviews

It's a whole lot of fun. And great to see the utterly different approaches given in the solutions, I love the a-ha moments, and this provides a nice collection of them. RL;"Geometry Snacks, a deliciously tasty, pocket-sized puzzle book by Ed Southall and Vincent Pantaloni. The idea behind the book is to show that problems can be solved in several ways, which means that, say the authors: "once a puzzle is solved, there are further surprises, insights and challenges to be had." Alex Bellos, The Guardian; Geometric reasoning is joyful and beautiful. Memorising the difference between complementary and supplementary angles... rather less so. Geometry Snacks doesn't shy away from the vocabulary of geometry, but its focus is squarely on the key ideas.;"It's a gorgeous little book (16cm by 16cm, 80 pages), with a stylised doughnut on the front to represent the bite-sized problems inside. It's in five sections, covering "find the fraction" puzzles, angle-finding, proofs, areas and sangaku, lovely 17th- to 19th-century Japanese puzzles largely involving circles.; What makes it special for me is the clarity and elegance of the diagrams. Careful use of grey and red shading generally makes it obvious what they're asking for; a lot of thought has gone into making the pictures pop..." The Aperiodical

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