Star Unfolding Polygons -- Volume Frameworks and Deformation Varieties -- Recent Advances in Real Geometric Reasoning -- The Relation Tool in GeoGebra -- Computer Theorem Proving for Verifiable Solving of Geometric Construction Problems -- Integrated Circumradius and Area Formulae for Cyclic Pentagons and Hexagons -- Extension of Simson-Wallace Theorem on Skew Quadrilaterals -- Current Status of the I2GATP Common Format -- On Flattenability of Graphs -- Discovering Geometric Theorems from Scanned and Photographed Images of Diagrams -- Combinatorial Rigidity and Independence of Generalized Pinned Subspace-Incidence Constraint Systems.