International Journal of Geometry

2021

TRAN QUANG HUNG and NGUYEN THI THUY DUONG – A generalization of Feuerbach’s theorem

TRAN QUANG HUNG and NGUYEN THI THUY DUONG – A generalization of Feuerbach’s theorem

ANASTASIOS N. ZACHOS – A generalization of Pythagoras on a surface in the sense of Toponogov

ANASTASIOS N. ZACHOS – A generalization of Pythagoras on a surface in the sense of Toponogov

DORIN ANDRICA and GEORGE C. ŢURCAŞ – The converse of the Newton-Gauss theorem

DORIN ANDRICA and GEORGE C. ŢURCAŞ – The converse of the Newton-Gauss theorem

MICHAEL N. FRIED – From any two directly similar figures, produce a new one

MICHAEL N. FRIED – From any two directly similar figures, produce a new one

NENAD STOJANOVIC – Tiling a plane with two types of semi-regular equilateral polygons

NENAD STOJANOVIC – Tiling a plane with two types of semi-regular equilateral polygons

LILIANA GABRIELA GHEORGHE – When Euler (circle) meets Poncelet (porism)

LILIANA GABRIELA GHEORGHE – When Euler (circle) meets Poncelet (porism)

GIOVANNI LUCCA – Inscribing circle chains inside an elliptical segment

GIOVANNI LUCCA – Inscribing circle chains inside an elliptical segment

DAN REZNIK and RONALDO GARCIA – Related by Similarity II: Poncelet 3 – periodics in the homothetic pair and the Brocard porism

DAN REZNIK and RONALDO GARCIA – Related by Similarity II: Poncelet 3 – periodics in the homothetic pair and the Brocard porism

LILIANA GABRIELA GHEORGHE and DAN REZNIK – A special conic associated with the Reuleaux negative pedal curve

LILIANA GABRIELA GHEORGHE and DAN REZNIK – A special conic associated with the Reuleaux negative pedal curve

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