MATH 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. | |
| Tau | Tau is the 19th letter of the Greek alphabet. | |
| Taylor Series | Many common functions can be written as an expansion of the function about a point in a form known as a Taylor Series. | |
| Term | In most mathematical expressions a single Term is isolated from other Terms by plus or minus signs. A monomial is a Term. | |
| 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. | |
| Third Quartile | For certain types of data, it is the 75th percentile. Also high quartile or upper quartile. | |
| 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. | |
| Transcendental Number | A Transcendental Number will not be the root of a polynomial with integer coefficients; it is an irrational number. | |
| 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. | |
| Transpose (Matrix) | When we interchange the rows and columns of a matrix we Transpose the Matrix. | |
| 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. | |
| Trapezoidal Rule | When approximating an integral in calculus we may treat each partition as a Trapezoid to determine the area under the curve. | |
| 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. | |
| Trigonometry | One of the more beautiful and elegant branches of mathematics, Trigonometry provides innumerable relationships built from similar (right) triangles. | |
| Trinomial | A polynomial with three terms. | |
| Triple | As a verb, Triple means to multiply by three. As a noun, the result from multiplication by three. | |
| Triple Product (Scalar) | Effectively, a Scalar Triple Product is akin to the determinant of a 3x3 matrix. | |
| 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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