# GEOMETRY GLOSSARY

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Title Description
Parabola The graph of a quadratic function is a Parabola, a conic section.
Parallel Lines Coplanar Lines that never meet or cross are Parallel.
If lines simply never cross, they may be skew (non-coplanar).
Parallel Planes Two distinct planes, collections of flat expansion of points, that never meet are considered Parallel Planes.
Parallel Postulate Given a line and a specific point not on the line, there is only one line through the specific point parallel to the given line.
Parallelepiped A shoebox is a Parallelepiped.
Any geometric body with six faces that are each parallelograms that are in planes parallel to the opposite face.
Parallelogram A quadrilateral with two pairs of parallel sides is a Parallelogram; it has many dependable properties.
Perfect Square Most generally a Perfect Square is an integer that is the product of another integer times itself.
Perimeter The distance around the outside of a planar object or a plane figure is its perimeter.
Perpendicular At right angles.
Perpendicular Bisector A line segment (or side of a polygon) has a unique line through its midpoint perpendicular to the line segment (or side).
Pi The constant ratio of circumference to diameter is represented by the 16th letter of the Greek alphabet; it is approximately 3.14159.
Plane An infinite expanse of points in two dimensions.
Plane Geometry Basic geometry is Plane Geometry.
We hold to the parallel postulate and Euclidean principles.
Point A location of infinitesimal size, that is, no size.
A mathematical idea.
Polygon A closed plane figure with straight sides.
Polyhedron A geometric solid with faces that are polygons.
Postulate A far-reaching conjecture or sense of reasoning for which an obvious and substantive base appears most reasonable.
Precision The quality of finer measurement or estimation is termed Precision.
Prism A Prism is a geometric solid with two congruent polygons within parallel bases connected by faces that are parallelograms.
Proof An ingredient in pudding.
Proper Subset A set that is a subset of a given set and not identical to the given set is a Proper Subset of the given set.
Proportional In a (constant) ratio.
Psi The 23rd letter (next-to-last) of the Greek alphabet.
Pyramid A geometric solid with a base of a polygon and planar lateral sides that meet at a point called an apex is termed a Pyramid.
Pythagorean Identities sin²x + cos²x = 1; 1 + tan²x = sec²x; 1 + cot²x = csc²x
Pythagorean Triple A series of three integers for whom the Pythagorean relation holds, as 3-4-5 or 5-12-13, because 3² + 4² = 5² and 5² + 12² = 13².

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