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Geometry Vocabulary, acute angle-an angle, measuring less than, 90 degrees, , angle-the turn or bend, between two, intersecting lines, line, segments, rays, or, planes, , angle bisector-an, angle bisector is a ray, that cuts an angle, exactly in half,, making two equal, angles, 45, 45, , circle-the set of all, points in a plane that, are a given distance, from a given point, , circumference-the, distance around the, edge of a circle., closed figure-the, boundary of a simple, two-dimensional, region, including, shapes with straight, and curved sides, , cone- threedimensional figure, with a curved surface,, a circular base and, one apex (point), , attribute- a, characteristic of an, object, such as color,, shape, or size, base-a face or surface, (3-D object) or a side, (2-D objects), considered as the, bottom part, or, foundation of a, geometric figure; used, for the purpose of, measurement, , base, , congruent- geometric, figures having the, same size and shape;, all corresponding, parts of congruent, figures have the same, measure, , coordinate plane-the, grid system in which, the x-axis and y-axis, provide reference, points, , diameter-the distance, across the widest part, of a circle; twice the, radius; also defined as, a chord that passes, through the center of, a circle, , cube-a threedimensional object, with 6 square faces, dilation- shrinking or, stretching the figure, , cylinder- threedimensional figure, with a curved surface, and two circular bases, edge- a line segment, at the intersection of, two faces of a, polyhedron, degree-a unit of, measure of angles;, there are 360 degrees, in a circle, diagonal- for a, polygon in the plane,, any line segment, joining non-adjacent, vertices., , equiangular, triangle- a triangle, which all angles are, congruent, , equilateral trianglea triangle which all, the sides are, congruent.

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face- a polygonal, region of a threedimensional figure, , heptagon- a polygon, with seven sides, , hexagon- A polygon, with six sides, , line-one of the three, undefined figures in, geometry, a line has, no thickness, is, perfectly straight, and, goes on forever in, both directions; two, points determine a, unique line, , line of symmetry-a, line over which a, figure can be, reflected, resulting in, a figure that looks, exactly like the, original, , intersecting lineslines that meet or, cross, , isosceles triangle-a, triangle having two, sides, called the legs,, of equal length, , octagon- a polygon, with eight sides, , one-dimensional- a, figure that has length, but no width or, height., , parallel lines- Lines, that lie in the same, plane and never meet., Also, planes lying in, space that never meet., , parallelogram-a, quadrilateral with, both pairs of opposite, sides parallel., line segment-a finite, portion of a line, often, denoted by its end, points, pentagon- a polygon, with five sides, net- a blueprint, or, pattern, for a three, dimensional model., , kite-a quadrilateral, with two pairs of, adjacent sides with, equal lengths., , obtuse angle-an angle, measuring between 90, and 180 degrees, , perpendicular lineslines in the same, plane which intersect, to form a right angle., , plane-one of the three, undefined figures in, geometry, a plane is a, flat expanse, like a, sheet of paper, that, goes on forever, plane figure-any two, dimensional figure, point-one of the three, undefined figures in, geometry, a point is a, location with no, length, width, and, height., polygon-a twodimensional closed, figure made up of, straight line segments., , polyhedron-a threedimensional closed, figure made up of, faces that are all, polygons, prism- a threedimensional figure, with parallelogram, faces and two parallel,, congruent bases, , 

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pyramid- a geometric, solid with a base that, is a polygon and all, other faces are, triangles with a, common vertex, , rectangular prism- a, three-dimensional, figure with, parallelogram faces, and two parallel,, congruent rectangular, bases., , , quadrilateral-a, polygon with four, sides, , rectangle-a, quadrilateral in which, all the angles have the, same measure (90, degrees), , similar-two or more, figures having the, same shape but not, necessarily the same, size, , right angle- an angle, measuring 90 degrees, rectangular, pyramid- a geometric, solid with a base that, is a rectangle and all, other faces are, triangles with a, common vertex, , radius-the distance, from the center of a, circle to any point on, its edge; half a, diameter, , ray-a portion of a line, extending in one, direction from a point, , rhombus- a, quadrilateral in which, all sides have the, same length, , slide- see translation, solid figure- a closed,, three dimensional, figure, rotation (turn)- a, transformation, obtained by rotating a, figure around a fixed, point (i.e., turning a, figure about a point)., , reflection (flip)-a, transformation which, produces the mirror, image of a figure (i.e.,, flipping a figure, across a line), , , , , , scalene- a polygon is, scalene if its sides are, all different lengths, , regular polygon- a, polygon in which all, angle and all sides are, congruent; examplesequilateral triangle,, square, regular, octagon, , sphere-the set of all, points in threedimensional space, that are located at a, given distance from, the center, , side- a line segment at, the boundary of a, polygon, , square- a regular, quadrilateral (all sides, and angles are, congruent), , symmetry- a figure, has symmetry if there, exists some line or, point through which, all points of the figure, can be reflected to, generate another point, on the figure

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tessellation- covering, of the plane,, sometimes referred to, as a tiling, referring to, the way that tiles, cover a floor, , triangular prism- a, three-dimensional, figure with, parallelogram faces, and two parallel,, congruent triangular, bases, , , three-dimensionalan object that has, length, width, and, height, transformation- a, rule for moving every, point in a plane figure, to a new location, translation (slide)- a, transformation that, slides a figure a given, distance in a given, direction, , trapezoid (inclusive), - a quadrilateral with, at least one set of, parallel sides., , triangle- a polygon, with three sides, , triangular pyramid a geometric solid with, a base that is a, triangle and all other, faces are triangles, with a common vertex, , , , , , turn- see rotation, two-dimensional- a, figure that has length, and width but not, height (i.e., a plane, figure such as a, rectangle or circle), vertex (vertices)- the, points where two line, segments come, together (corner