| Title |
Description |
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| 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. |
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| Tangent Line |
A Line is said to be Tangent to a function when it touches the graph of the function at a single point. |
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| Tau |
Tau is the 19th letter of the Greek alphabet. |
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| 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. |
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| Term |
In most mathematical expressions a single Term is isolated from other Terms by plus or minus signs. A monomial is a Term. |
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| 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). |
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| Tessellate |
A planar pattern of repeating geometric shapes is a Tessellation; to produce these shapes is to Tessellate. |
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| Tetrahedron |
A polyhedron with four faces. |
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| Theorem |
A mathematical principle typically proved with some rigor is often a Theorem. |
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| Theta |
The eighth letter of the Greek alphabet is Theta, a common variable for an angle. |
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| Third Quartile |
For certain types of data, it is the 75th percentile. Also high quartile or upper quartile. |
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| Three Dimensions |
The Dimensions of space or volume are Three Dimensions, typically labeled with rectangular, spherical, or cylindrical coordinates. |
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| Three-Dimensional Coordinates |
Three-Dimensional Coordinates require an ordered triple to label a point in space. |
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| Transcendental Number |
A Transcendental Number will not be the root of a polynomial with integer coefficients; it is an irrational number. |
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| 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. |
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| Transpose (Matrix) |
When we interchange the rows and columns of a matrix we Transpose the Matrix. |
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| Transversal |
A line that crosses two or more parallel lines is often termed a Transversal. |
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| 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. |
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| Trapezoid |
A quadrilateral with one pair of parallel sides (U.S.); the same figure is a trapezium in some other English-speaking countries. |
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| Trapezoidal Rule |
When approximating an integral in calculus we may treat each partition as a Trapezoid to determine the area under the curve. |
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| Triangle |
A three-sided polygon. Triangles are either acute, right, or obtuse. |
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| Triangulation |
We may conduct geographic surveys or determine the altitude of various objects by a process termed Triangulation. |
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| 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. |
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| Trigonometry |
One of the more beautiful and elegant branches of mathematics, Trigonometry provides innumerable relationships built from similar (right) triangles. |
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| Trinomial |
A polynomial with three terms. |
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| Triple |
As a verb, Triple means to multiply by three. As a noun, the result from multiplication by three. |
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| Triple Product (Scalar) |
Effectively, a Scalar Triple Product is akin to the determinant of a 3x3 matrix. |
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| Truncation |
Replace the lesser digits of some number with zeros with no regard for rounding; this is Truncation. |
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| Two Dimensions |
A plane has Two Dimensions. Planar figures are Two Dimensional. |
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