CD Tesis
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’ Theorem on a convex quadrilateral is equal to four times the area
of the ba- sic quadrilateral. In addition, the difference in the area of the
opposite planes formed from the Cross’ Theorem on a nonconvex quadrilateral
is equal to four times the area of the base quadrilateral.
Keywords: Convex quadrilateral, nonconvex quadrilateral, Cross’ Theorem
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