Affiana, Adhe2023-12-042023-12-042023-08PerpustakaanElfitrahttps://repository.unri.ac.id/handle/123456789/11249This article discusses the development of the mixtilinear excircle concept on cyclic quadrilaterals. The expansion was carried out to show the various relationships formed from several mixtilinear excircle radii constructed from the side extensions of the cyclic quadrilateral. At any △ABC is constructed three a mixtilinear excircle that differs from point D on the circumcircle so that the cyclic quadrilateral ABCD is obtained. By formulating the various radii of the mixtilinear excircle it is shown that the ratio of the product of the radii of the mixtilinear excircle of adjacent triangles is equal to the ratio of the diagonals.enTrianglecyclic quadrilateralmixtilinear excircleArticle