# 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 x-axis, 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.
Three-Dimensional Coordinates Three-Dimensional 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 English-speaking 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 English-speaking countries.
Triangle A three-sided 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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