“Research interests concerning and approaches to the teaching and learning of secondary geometry are wide and diverse. … The variety of interests and approaches is reflected in the collection of papers presented in the monograph. … What is clear from each offering is the recognition of the importance and power of geometry, the need for those concerned to comprehend concepts, and the influence of teachers on the outcomes of their wards.” (Rachael Horsman, Research in Mathematics Education, November 19, 2018)

• ​Section 1: Mathematical, Epistemological, and Curricular Perspectives.- Thinking About The Teaching of Geometry Through the  Lens of Geometrical  Work and Geometrical Paradigms.- Epistemological Features of a Constructional Approach To Regular 4-Polytopes.- Geometry Opportunites For Reasoning and Proof in  Secondary School Textbooks in Trinidad and Tobago.- Enacting Functions  from Geometry To Algebra.- Section 2: Studies of Geometry Instruction and Teacher Knowledge.- Examining The Work of Teaching Geometry as a Subject-Specific Phenomenon.- Creating Profiles of Geometry Teachers’ Pedagogical Content Knowledge.- Symbiosis Between Subject Matter and  Pedagogical Knowledge in Geometry.- Designing Instruction Towards Mathematical Literacy in Geometry: a Case Study.- Minding the Gap: a Comparison Between Pre-Service and Practicing High School Geometry Teachers’ Geometry Teaching Knowledge.- Some Notes on Teaching Geometry in Secondary School: a Teacher Training Experience.- Section 3: Studies of Geometry Thinking and Learning.- Exploring Models of Secondary Geometry Achievement.- Connectedness of Problems and Blockage Resolution in the Solving Process: a Major Educational Challenge.- The Use of Writing as a Metacognitive Tool in Geometry Learning.- Development of Spatial Ability Results from the Research Project Geodikon.- Middle School Students' Use of Property Knowledge and Spatial Visualization in Reasoning About 2D Rotations.- Aspects of Spatial Thinking in Problem Solving: Focusing on Viewpoints in  Constructing Internal Representation.- Engaging Students with Non-Routine Geometry Proof  Tasks.- Playing With Geometry: An Educational Inquiry Game  Activity.- Differences in Self-Reported Instructional Strategies Using a Dynamic Geometry Approach that Impact Students’ Conjecturing.- Conclusion.- The Editors.

“Research interests concerning and approaches to the teaching and learning of secondary geometry are wide and diverse. … The variety of interests and approaches is reflected in the collection of papers presented in the monograph. … What is clear from each offering is the recognition of the importance and power of geometry, the need for those concerned to comprehend concepts, and the influence of teachers on the outcomes of their wards.” (Rachael Horsman, Research in Mathematics Education, November 19, 2018)

• ​Section 1: Mathematical, Epistemological, and Curricular Perspectives.- Thinking About The Teaching of Geometry Through the  Lens of Geometrical  Work and Geometrical Paradigms.- Epistemological Features of a Constructional Approach To Regular 4-Polytopes.- Geometry Opportunites For Reasoning and Proof in  Secondary School Textbooks in Trinidad and Tobago.- Enacting Functions  from Geometry To Algebra.- Section 2: Studies of Geometry Instruction and Teacher Knowledge.- Examining The Work of Teaching Geometry as a Subject-Specific Phenomenon.- Creating Profiles of Geometry Teachers’ Pedagogical Content Knowledge.- Symbiosis Between Subject Matter and  Pedagogical Knowledge in Geometry.- Designing Instruction Towards Mathematical Literacy in Geometry: a Case Study.- Minding the Gap: a Comparison Between Pre-Service and Practicing High School Geometry Teachers’ Geometry Teaching Knowledge.- Some Notes on Teaching Geometry in Secondary School: a Teacher Training Experience.- Section 3: Studies of Geometry Thinking and Learning.- Exploring Models of Secondary Geometry Achievement.- Connectedness of Problems and Blockage Resolution in the Solving Process: a Major Educational Challenge.- The Use of Writing as a Metacognitive Tool in Geometry Learning.- Development of Spatial Ability Results from the Research Project Geodikon.- Middle School Students' Use of Property Knowledge and Spatial Visualization in Reasoning About 2D Rotations.- Aspects of Spatial Thinking in Problem Solving: Focusing on Viewpoints in  Constructing Internal Representation.- Engaging Students with Non-Routine Geometry Proof  Tasks.- Playing With Geometry: An Educational Inquiry Game  Activity.- Differences in Self-Reported Instructional Strategies Using a Dynamic Geometry Approach that Impact Students’ Conjecturing.- Conclusion.- The Editors.

“Research interests concerning and approaches to the teaching and learning of secondary geometry are wide and diverse. … The variety of interests and approaches is reflected in the collection of papers presented in the monograph. … What is clear from each offering is the recognition of the importance and power of geometry, the need for those concerned to comprehend concepts, and the influence of teachers on the outcomes of their wards.” (Rachael Horsman, Research in Mathematics Education, November 19, 2018)

• ​Section 1: Mathematical, Epistemological, and Curricular Perspectives.- Thinking About The Teaching of Geometry Through the  Lens of Geometrical  Work and Geometrical Paradigms.- Epistemological Features of a Constructional Approach To Regular 4-Polytopes.- Geometry Opportunites For Reasoning and Proof in  Secondary School Textbooks in Trinidad and Tobago.- Enacting Functions  from Geometry To Algebra.- Section 2: Studies of Geometry Instruction and Teacher Knowledge.- Examining The Work of Teaching Geometry as a Subject-Specific Phenomenon.- Creating Profiles of Geometry Teachers’ Pedagogical Content Knowledge.- Symbiosis Between Subject Matter and  Pedagogical Knowledge in Geometry.- Designing Instruction Towards Mathematical Literacy in Geometry: a Case Study.- Minding the Gap: a Comparison Between Pre-Service and Practicing High School Geometry Teachers’ Geometry Teaching Knowledge.- Some Notes on Teaching Geometry in Secondary School: a Teacher Training Experience.- Section 3: Studies of Geometry Thinking and Learning.- Exploring Models of Secondary Geometry Achievement.- Connectedness of Problems and Blockage Resolution in the Solving Process: a Major Educational Challenge.- The Use of Writing as a Metacognitive Tool in Geometry Learning.- Development of Spatial Ability Results from the Research Project Geodikon.- Middle School Students' Use of Property Knowledge and Spatial Visualization in Reasoning About 2D Rotations.- Aspects of Spatial Thinking in Problem Solving: Focusing on Viewpoints in  Constructing Internal Representation.- Engaging Students with Non-Routine Geometry Proof  Tasks.- Playing With Geometry: An Educational Inquiry Game  Activity.- Differences in Self-Reported Instructional Strategies Using a Dynamic Geometry Approach that Impact Students’ Conjecturing.- Conclusion.- The Editors.