GEOMETRY GLOSSARY
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Title  Description  

Tangent  A line that touches a function curve at a single point is said to be Tangent to the function. Tangent is also one of the six basic trigonometric functions; it is the ratio of the opposite side (from a specified angle) of a right triangle to the adjacent side. 

Tangent Line  A Line is said to be Tangent to a function when it touches the graph of the function at a single point. 

Terminal Side of an Angle  When in standard position, an Angle has an initial side, a ray on the positive xaxis, and a Terminal Side where the rotation of the angle stops, at an angle of specific measure (in degrees or radians). 

Tessellate  A planar pattern of repeating geometric shapes is a Tessellation; to produce these shapes is to Tessellate. 

Tetrahedron  A polyhedron with four faces. 

Theorem  A mathematical principle typically proved with some rigor is often a Theorem. 

Theta  The eighth letter of the Greek alphabet is Theta, a common variable for an angle. 

Three Dimensions  The Dimensions of space or volume are Three Dimensions, typically labeled with rectangular, spherical, or cylindrical coordinates. 

ThreeDimensional Coordinates  ThreeDimensional Coordinates require an ordered triple to label a point in space. 

Transitive Property  The Transitive Property is exhibited when three values are related in the following manner: If A = B and B = C, then A = C. The relation need not be equality. 

Transversal  A line that crosses two or more parallel lines is often termed a Transversal. 

Trapezium  In the United States, a quadrilateral with no parallel sides; in other Englishspeaking countries, what Americans term a trapezoid, a quadrilateral with one pair of parallel sides. 

Trapezoid  A quadrilateral with one pair of parallel sides (U.S.); the same figure is a trapezium in some other Englishspeaking countries.  
Triangle  A threesided polygon. Triangles are either acute, right, or obtuse. 

Triangulation  We may conduct geographic surveys or determine the altitude of various objects by a process termed Triangulation. 

Trigonometric Identities  The various statements in Trigonometry that are universally true, typically for any angle in the statement, are called Trigonometric Identities. For example, sin²x + cos²x = 1 for any angle x. 

Truncation  Replace the lesser digits of some number with zeros with no regard for rounding; this is Truncation. 

Two Dimensions  A plane has Two Dimensions. Planar figures are Two Dimensional. 
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