|Coplanar lines that do not intersect.|
|A quadrilateral with both pairs of opposite sides parallel.|
|Planes that do not intersect.|
|The sum of the lengths of its three sides.|
|Two lines which intersect to form a right angle.|
|A perpendicular bisector of a side is perpendicular to that side at its midpoint.|
|The union of three or more coplanar segments such that each endpoint is shared by exactly two segments; segments intersect only at their endpoints; and intersecting segments are noncollinear.|
|A statement that is accepted without proof.|
|A polyhedron with two congruent polygonal faces, called the bases, in parallel planes.|
|A polyhedron composed of a polygonal region, called the base, and triangular regions, called the lateral faces which intersect at a vertex.|
Note: The terms in this collection may not
be entirely accurate.
They are for reference only.