Geometry Glossary

parallel lines:	Coplanar lines that do not intersect.
parallelogram:	A quadrilateral with both pairs of opposite sides parallel.
parallel planes:	Planes that do not intersect.
perimeter of equilateral triangle:	The sum of the lengths of its three sides.
perpendicular:	Two lines which intersect to form a right angle.
perpendicular bisector:	A perpendicular bisector of a side is perpendicular to that side at its midpoint.
polygon:	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.
postulate:	A statement that is accepted without proof.
prism:	A polyhedron with two congruent polygonal faces, called the bases, in parallel planes.
pyramid:	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.

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