Pengembangan Teorema Cross Pada Segiempat Konveks Dan Segiempat Nonkonveks

This thesis discusses the modification of the Cross’ Theorem on a convex quadrilateral and an expanded nonconvex quadrilateral by constructing a square pointing outward on each side of the Cross’ Theorem quadrilateral. The proof process is done using the sine and cosine rules. The result obtained is that the total area of flat figures that are opposite each other formed from the Cross�…