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.