@inbook{10.4169/j.ctt5hh9ht.10,
ISBN = {9780883857847},
URL = {http://www.jstor.org/stable/10.4169/j.ctt5hh9ht.10},
abstract = {The geometric objects we have studied until now have been relatively simple: just lines, triangles, and circles. In the remainder of the book we will need to use polygons with more sides; specifically, we will study four-sided and six-sided figures. This chapter contains the necessary information about four-sided polygons.Let us begin by repeating the definitions from Chapter 0. Four pointsA , B , C ,andDsuch that no three are collinear determine aquadrilateraldenoted by$\square ABCD$. It is defined to be the union of four segments:$ABCD = \overline {AB} \cup \overline {BC} \cup \overlineThe four segments are thesidesof the},
bookauthor = {Gerard A. Venema},
booktitle = {Exploring Advanced Euclidean Geometry with GeoGebra},
edition = {1},
pages = {53--56},
publisher = {Mathematical Association of America},
title = {Quadrilaterals},
year = {2013}
}