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 (noncoplanar). 

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 farreaching 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 (nexttolast) 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 345 or 51213, because 3² + 4² = 5² and 5² + 12² = 13². 
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