TRIGONOMETRY 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.
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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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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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Tetrahedron A polyhedron with four faces.
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Theta The eighth letter of the Greek alphabet is Theta, a common variable for an angle.
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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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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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