X - Math terms glossary

x-axis  The horizontal number line in a coordinate graph. The line in the coordinate plane or in space, usually horizontal, containing those points whose second coordinates (and third, in space) are 0. x-coordinate  The first coordinate of an ordered pair or an ordered triple. Ex: in the coordinate pair (3,-8), the three is

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Y - Math terms glossary

y-axis The vertical number line in a coordinate graph. The line in the coordinate plane, usually vertical, or in space, containing those points whose first coordinates (and third, in space) are 0. y-coordinate   The second coordinate of an ordered pair or ordered triple. Ex: in the coordinate pair (3,-2), the

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Z - Math terms glossary

z-axis The line in a three-dimensional coordinate system containing those points whose first and second coordinates are 0. zero angle An angle whose measure is zero.

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V - Math terms glossary

value of a numerical expression  The number that is the result of evaluating a numerical expression. Ex: the value of 2+3X4 is 14. Remember, the order of operations says that multiplication must be done first when evaluating this.value of an algebraic expression The number that is the result of evaluating an

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W - Math terms glossary

walk The composite of a reflection and a translation parallel to the reflecting line, also known as a glide reflection. whole number Any of the numbers 0, 1, 2, 3, ... . width (of a rectangle) A dimensional of a rectangle or rectangular solid taken at right angles to the length.window That part of the plane that shows on the

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T - Math terms glossary

table  An arrangement of data in rows and columns. Take-away Model for Subtraction If a quantity y is taken away from an original quantity x with the same units, the quantity left is x - y. tangent A line, ray, segment, or plane which intersects a curve or curved surface in exactly one point. tangent

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U - Math terms glossary

undefined terms A term used without a specific mathematical definition. uniform scale   A scale in which numbers that are equally spaced differ by the same amount. When creating a number line or coordinate grid system, you use a uniform scale. Ex: union of two sets The set of elements which are in at

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S - Math terms glossary

scale factor of size transformation In similar figures, the ratio of a distance or length in an image to the corresponding distance or length in a preimage. Also called ratio of similitude. Ex: When comparing the following small right triangle to its similar large right triangle, we see a scale factor of 1/2 or 0.5.scalene

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R - Math terms glossary

radius of a circle or sphere A segment connecting the center of a circle or a sphere with a point on that circle or sphere, also, the length of that segment. Plural is radii. rate  A quantity whose unit contains the word " per " or  " for each " or some synonym.Ex: miles per hour, beats per minute, candy bars for each childrate

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P - Math terms glossary

palindrome A number or word that reads the same way from right to left as it does left to right. EX: BOB121A MAN A PLAN A CANAL PANAMAABLE WAS I ERE I SAW ELBA parabola The conic section formed by a plane parallel to an edge of the conical surface. paragraph proof A form of written proof in which conclusions and

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Q - Math terms glossary

quadrant  One of the four parts into which the coordinate plane is divided by the x-axis and y-axis. Quadrants are labeled with Roman Numerals as shown below. quadrilateral A four-sided polygon. Examples: quadrillion  A word name for 1,000,000,000,000,000 or . quadrillionth  A word name for

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N - Math terms glossary

natural number Any one of the numbers 1, 2, 3, ... . Also called positive integer. These are sometimes called "counting numbers". n-fold rotation symmetry A figure has n-fold rotation symmetry, where n is a positive integer, when a rotation of magnitude 360/n maps the figure onto itself, and no larger value of n has this property.

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O - Math terms glossary

oblique cone A cone whose axis is not perpendicular to its base. oblique figure A 3-dimensional figure in which the plane of the base(s) is not perpendicular to its axis or to the planes of its lateral surfaces. oblique line A line that is neither horizontal nor vertical. obtuse angle   An

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magnitude of rotation In a rotation, the amount that the preimage is turned about the center of rotation, measured in degrees from -180 (clockwise) to 180 (counterclockwise), +/- m

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L - Math terms glossary

lattice point A point in the coordinate plane or in space with integer coordinates. legs of a right triangle Either side of a right triangle that is on the right angle. Segments are the legs of this right triangle. leg adjacent to an angle The side of the right triangle which

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K - Math terms glossary

key in   To press keys or enter information into a calculator. key sequence A set of instructions for what to key in on a calculator. When writing out a key sequence, operations and symbols like parentheses are typically drawn in rectangles indicating what hey to press.EX: One key sequence for the expression would be *Remember

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J - Math terms glossary

justification A definition, postulate, or theorem which enables a conclusion to be drawn. Ex: In the proof below, the justifications are in red.

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I - Math terms glossary

icosahedron A polyhedron with twenty faces. identity transformation A transformation that maps each point onto itself.if and only if statement A statement consisting of a conditional and its converse. Also called biconditional.EX:A quadrilateral is a square if and only if it is a rhombus and a rectangle.NOTE: The if and only

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H - Math terms glossary

half turn A turn of 180°. height In a triangle or trapezoid, the segment from a vertex perpendicular to the line containing the opposite side; also, the length of that segment. In a prism or cylinder, the distance between the bases. In a pyramid or cone, the length of a segment from the vertex perpendicular to the plane of the base. Also

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G - Math terms glossary

gallon (gal) A unit of capacity in the U.S. system of measurement equal to 4 quarts. generalization   A statement that is true about many instances.glide reflection The composite of a reflection and a translation parallel to the reflecting line, also known as a walk.gores Tapered sections of a net for a spherical object. grade

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