International Journal of Geometry

Vol. 7 (2018), No. 1, April

DAVID FRAIVERT – New applications of method of complex numbers in the geometry of cyclic quadrilaterals
HIROSHI OKUMURA – Wasan geometry with the division by 0
PARIS PAMFILOS – Circles associated to pairs of conjugate diameters
FEYZA E. ERDOĞAN, SELCEN Y. PERKTAŞ and RIFAT GÜNEŞ – Half-lightlike submanifolds with degenerate and non-degenerate planar normal sections in pseudo – Euclidean spaces
JAWAD SADEK and KURT FINK – The least squares point of a quadrilateral
JORGE C. LUCERO – Geometric solution of a quintic equation by two-fold origami
AHMAD TAWFIK ALI – A constant angle ruled surfaces
LEONARD M. GIUGIUC, DAO T. OAI and KADIR ALTINTAS – An inequality related to the lengths and area of a convex quadrilateral
MARTIN JOSEFSSON – Properties of tilted kites
MIKHAIL N. GUROV and MAKAR A. VOLKOV – Chains of tangent circles inscribed in curvilinear triangles