ABSTRACT MARDANI FITRA. 2210246883, Angle Bisector and Angle Trisector in Intersecting Quadrilaterals, Supervised by Mashadi and Sri Gemawati. This thesis discusses the study of geometry on intersecting quadrilaterals, par- ticularly regarding the construction and properties of angle bisectors and angle trisectors. The main focus of this research is to determine the lengths of the angle b…