**2.**angle An angle whose measure is 90 degrees.**4.**The steepness of a line expressed as a ratio, using any two points on the line.**6.**The line segment connecting two nonadjacent vertices in a polygon.**8.**The result of two numbers being multiplied together.**9.**The bottom of a plane figure or three-dimensional figure.**10.**A mathematical statement that says that two expressions have the same value; any number sentence with an =.**12.**A portion of the circumference of a circle.**13.**To substitute number values into an expression.**15.**The study of sound reasoning.**19.**A point on a line segment that divides the segment into two congruent segments.**20.**A type of drawing used to represent data.**21.**A polyhedron with a polygonal base and lateral faces that taper to an apex.**23.**A real number greater than zero.**26.**A polygon with 4 sides.**29.**The union of two rays with a common endpoint, called the vertex.**31.**A triangle each of whose angles measures less than 90 degrees.**34.**The ratio of the circumference of a circle to its diameter.**35.**A mathematical expression which shows that two quantities are not equal.**36.**For an experiment, the total number of successful events divided by the total number of possible events.**37.**A line segment that connects two points on a curve. that are a fixed distance from a given point, called the center.**39.**A triangle with an obtuse angle.**42.**Pair On the coordinate plane, the pair of numbers giving the location of a point**43.**The set of points in a plane**44.**The value of y at the point where a curve crosses the y-axis.**46.**The set of numbers that includes zero and all of the natural numbers.**48.**A quadrilateral with four equal sides and four 90 degree angles.**49.**A equation that states a rule or a fact.**51.**Two lines are parallel if they are in the same plane and never intersect.**52.**The _____ of an equation is the same as the solution to the equation.**53.**A value that does not change.**54.**A line with zero slope.**55.**Like a line. A description of any graph or data that can be modeled by a linear polynomial.**57.**Tilted at an angle; neither vertical nor horizontal.**59.**A three-dimensional figure with one vertex and a circular base**60.**Information that is gathered.

**1.**number A real number that is less than zero.**3.**The point on an angle where the two sides intersect.**5.**A device for measuring angles.**7.**A whole number that is not divisible by 2.**11.**One of two or more expressions that are multiplied together to get a product.**14.**In probability, a set of outcomes.**16.**The additive identity; the number that, when added to another number n, gives n.**17.**The distance from the center to a point on a circle; the line segment from the center to a point on a circle.**18.**The horizontal axis in a Cartesian coordinate plane.**21.**The distance around the outside of a plane figure. For a polygon, the perimeter is the sum of the lengths of the sides.**22.**The middle number in a data set when the data are put in order; a type of average.**23.**The theorem that relates the three sides of a right triangle**24.**A limitless quantity.**25.**value The distance of a number from zero; the positive value of a number.**27.**The vertical axis in a Cartesian coordinate system.**28.**part of a line, with one endpoint, and extending to infinity in one direction.**30.**The value of x at the point where a line or curve crosses the x-axis.**32.**A number that indicates the operation of repeated multiplication.**33.**The side opposite the right angle in a right triangle.**38.**A flat surface of a three-dimensional figure.**40.**A line that intersects two other lines.**41.**A three-sided polygon.**45.**A number used to name a part of a group or a whole. The number below the bar is the denominator, and the number above the bar is the numerator.**47.**The value of a variable that makes an equation true.**50.**A type of average; the number (or numbers) that occurs most frequently in a set of data.**53.**A three-dimensional figure having two parallel bases that are congruent circles.**56.**triangle A triangle that contains a right angle.**58.**To divide into two congruent parts.