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# Geometry Glossary - P a|b|c|d|e|g|h|i|k|l|m|o|p|q|r|s|t|v|x|y|

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# 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.