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| Two angles in a plane which share a common vertex and a common side but do not overlap. |
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| The surface included within a closed figure, measured by the number of square units needed to cover the surface. |
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| Point B is between points A and C if it is on the line segment connecting A and C. |
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| circumference A complete circular arc. |
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| line, or plane that divides a geometric figure into two congruent halves. |
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| If the sum of the measures of two angles is 90° |
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| connect two vertices (the corners) of a polygon and have all or part of the line go OUTSIDE the polygon, |
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| A three dimensional figure with a single base tapering to an apex. The base can be any simple closed curve. |
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| Exactly equal in size and shape. same length. |
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| An additional geometric figure that is constructed to assist in solving a problem or producing a proof. |
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| straight lines that connect every single vertex and your lines never go outside the polygon. |
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| On the coordinate plane, the pair of numbers giving the location of a point (ordered pair). of a point (ordered triple). |
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| Points or lines that all lie in the same plane. |
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| A three-dimensional geometric figure with parallel congruent bases. The bases can be shaped like any closed plane figure (not necessarily a circle) and must be oriented identically. |
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| measures things that are circular |
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| A line segment between two points on the circle or sphere which passes through the center. |
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| A straight line along which two faces of a solid meet. face A planar surface of a solid figure. |
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| The side of a right triangle opposite the right angle. |
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Definition
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| The geometric figure formed by two points. |
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| a pair of adjacent angles formed by intersecting lines |
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| Part of a line between two points called endpoints. |
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| The point halfway between two given points. |
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| An angle that has measure more than 90° and less than 180°. |
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| one of the two pairs of equal angles formed when two straight lines intersect eachother |
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| two things directly across eachother |
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| Two or more straight coplanar lines that do not intersect |
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| The distance around the outside of a plane figure.the sides. |
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| A flat surface extending in all directions. |
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| The geometric figure formed at the intersection of two distinct lines. |
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| A closed plane figure for which all sides are line segments. |
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Definition
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| A solid with no curved surfaces or edges. All faces are polygons and all edges are line segments. |
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| A statement accepted as true without proof. |
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| A solid with parallel congruent bases which are both polygons. The bases must be oriented identically. |
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| argument that shows something (like a theorem) is true beyond any doubt. |
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| A polyhedron with a polygonal base and lateral faces that taper to an apex. |
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| A part of a line starting at a particular point and extending infinitely in one direction. |
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| They are straight lines that are neither parallel, nor intersecting. They lie in different planes. |
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| A three dimensional solid consisting of all points equidistant from a given point. |
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| Two angles that add up to 180°. |
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| An assertion that can be proved true using the rules of logic. |
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Definition
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| A corner point of a geometric figure. |
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| line that goes up and down |
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Definition
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| An angle that has measure less than 90° |
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