Unit 1 Vocabulary: Geometry

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Radical Expression

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Mathematical expressions that contain a root symbol (√), which signifies the root of a number or an algebraic expression.

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Root/index

Back

Degree of the root.

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Radicand

Back

The number or variable under the radical sign.

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Coefficient

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The number of the expression outside of the radical sign.

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Undefined Terms

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Words that do not have formal definitions, but there is agreement about what they mean. In geometry, the words points, lines, and plane are undefined terms.

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Point

Back

A location and has no size.

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Line

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Consists of infinitely many points on a straight path that extends in two opposite directions with no end and no thickness.

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Plane

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Consists of infinitely many points and lines on a flat surface that extends without end and has no thickness.

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Line Segment

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Consists of two endpoints and all the points between them.

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Ray

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Defined as part of a line that has a fixed starting point (endpoint) and extends infinitely in one direction.