**TI83F* AppVariable file 03/21/07, 14:43(b bGLGE01bbnav 9AE51D1EC13445C5B24A00CF0B737DCFGLGE01.GLGE011   acute angle, !Gacute angle:An angle with a measure greater than 0 and less than 90. adjacent angles"!adjacent angles:Angles that have the same vertex, share a common side, and do not overlap. In the figure, 1 and 2 are adjacent angles angleE!angle:A figure formed by two rays with a common endpoint. In the figure, RST is formed by rays SR and ST with the common endpoint(or vertex) S. angle bisector\!angle bisector:A ray whose endpoint is the vertex of the angle and is located in the interior of the angle. It separates a given angle into two angles with equal measure. In the figure, seg. PW is the angle bisector of P. area Zarea:The number of square units needed to cover a surface enclosed by a geometric figure. "base of a three-dimensional figureRbase of athree-dimensional figure:The faces on the top and bottom of the figure.  betweenness\J!ibetweenness:Point R is between points P and Q if and only if R, P, and Q are collinear and PR + RQ = PQ.  circumference,circumference:The distance around a circle.  collinear points2!rcollinear points:Three or more points that lie on the same line. In the figure, P, Q, and R are collinear points.  complementary angles"!complementary angles:Two angles are complementary if the sum of their measures is 90. In the figure,1 and 2 are complementary angles.  concave polygon-=!concave polygon:A polygon for which a point on at least one of its diagonals lies outside the polygon. In the figure, diagonal JL lies outside polygon JKLMN.  coneW!zcone:A three-dimensional figure with one circular base and one vertex. A curved surface connects the base and the vertex.   congruent#congruent:Having the same measure.  constructionVconstruction:The process of drawing a figure using only a compass and a straightedge. convex polygon!]convex polygon:A polygon for which all diagonals are located in the interior of the polygon. coplanarsB!coplanar:Points or lines that lie in the same plane. In the plane M, points A, B, and C are coplanar, and seg. AB and seg. BC are coplanar. cylinderr%!6cylinder:A solid figure whose bases are formed by congruent circles in parallel planes and whose lateral surface is curved. The segment whose endpoints are the centers of the circular bases is called the axis of the cylinder. The altitude is a segment perpendicular to the bases with an endpoint in each base. deductive reasoningodeductive reasoning:The process of using facts, rules, definitions, or properties to reach a valid conclusion. degreedegree:The most common unit of measure for angles. If a circle were divided into 360 equal-sized parts, each part would have an angle measure of 1 degree, denoted as 1. edge>edge:The intersection of faces of a three-dimensional figure. exterior of an angle*!^exterior of an angle:All points outside the sides of the angle. A is in the exterior of XYZ. #face of a three- dimensional figureTface of athree- dimensional figure:The flat surface of a three-dimensional figure. interior of an angleCinterior of an angle:All points between the two sides of an angle. line#line:A never-ending straight path.  line segmentO!Vline segment:Part of a line containing two endpoints and all the points between them. locus8locus:The set of points that satisfy a given condition. midpointMmidpoint:On a line segment, the point that is halfway between the endpoints. n-gonn-gon:A polygon with n sides.  obtuse angleER!Fobtuse angle:An angle that measures more than 90 but less than 180.  opposite raysG!opposite rays:Two rays that are part of the same line and have only their endpoints in common. In the figure, ray XY and ray YZ are opposite rays.  perimeter9perimeter:The distance around a closed geometric figure.  perpendicular lines(!aperpendicular lines:Lines which meet to form right angles and whose slopes have a product of -1.! planeL!Eplane:A two-dimensional flat surface that extends in all directions." Platonic SolidsqPlatonic Solids: The five regular polyhedra: tetrahedron, hexahedron, octahedron, dodecahedron, or icosahedron.# point:point:A specific location in space with no size or shape.$ polygonQpolygon:A simple closed figure in a plane formed by three or more line segments.%  polyhedronOpolyhedron:A solid with four or more flat surfaces that are polygonal regions.&  precisionprecision:The preciseness of a measurement depends on the unit of measure. The smaller the unit, the more precise the measurement.' prismT!prism:A polyhedron with two parallel, congruent faces called bases. A solid with the following characteristics:1. Two faces, called the bases, are formed by congruent polygons that lie in parallel planes.2. The faces that are not bases, called lateral faces, are formed by parallelograms.3. The intersection of two adjacent lateral faces are called lateral edges and are parallel segments.( pyramidt_!pyramid:A solid figure that has a polygon for a base and triangles for sides. A pyramid is named for the shape of its base. A solid with the following characteristics:1. All the faces, except one, intersect at a common point called the vertex.2. The face that does not intersect at the vertex is called the base. The base is formed by a polygon.3. The faces meeting at the vertex are called lateral faces. They are formed by triangles.) rayTray:A part of a line that extends indefinitely in one direction from a fixed point.* regular polygon.Z!Qregular polygon:A polygon that has all sides congruent and all angles congruent.+ regular polyhedron7!Sregular polyhedron:A polyhedron in which the faces are regular congruent polygons.,  regular prismBregular prism:A right prism with bases that are regular polygons.- relative errorqrelative error:The ratio of the half-unit difference in precision to the entire measure, expressed as a percent..  right angle/!0right angle:An angle that measures exactly 90./ sides of an angle?!dsides of an angle:The two rays that form an angle. In the figure, rays SR and ST are sides of RST.0 space7space:A boundless three-dimensional set of all points.1 sphere:!csphere:The set of all points in space that are a given distance from a given point, called the center. It has the following characteristics:1. A radius is a segment whose endpoints are the center and a point on the sphere.2. A chord is a segment whose endpoints are points on the sphere.3. A diameter is a chord of the sphere that contains the center.2 supplementary angles[-!Xsupplementary angles:Two angles are supplementary if the sum of their measures is 180.3  surface areaRsurface area:The sum of the areas of all the faces of a three-dimensional figure.4 vertex of an angleFvertex of an angle:The common endpoint of the rays forming the angle.5 vertical anglesD5!vertical angles:Opposite angles formed by the intersection of two lines. 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