Two rays sharing a common endpoint.

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An angle that has measure less than 90°.

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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 points A and C if it is on the line segment connecting A and C.[image]

A line segment, line, or plane that divides a geometric figure into two congruent halves.

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A complete circular arc. Also means the distance around the the outside of a circle.

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Lying on the same line.

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whatever size is necessary so that, if you stick them together, they make a 90 degree angle.

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if you can 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.

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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. There is no cave!

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A pair of numbers that describe the position of a point.

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Lying in the same plane. For example, any set of three points in space.

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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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A unit of angle measure equal to of a complete revolution.

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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 line segment joining two adjacent vertices in a polygon.

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A planar surface of a solid figure.

The side of a right triangle opposite the right angle.

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The geometric figure formed by two points.

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formed when two lines intersect.

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All points between two given points (including the given points themselves).

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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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When two lines intersect, four angles are formed.

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two rays with a common endpoint that form a straight line .

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the two lines are always the same distance apart.

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The distance around the outside of a plane figure.

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At a 90° angle.

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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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A solid with no curved surfaces or edges. All faces are polygons and all edges are line segments.

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a true statement, which does not require to be proved.

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A solid with parallel congruent bases which are both polygons. The bases must be oriented identically.

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A set of logical arguments used to deduce or prove a mathematical theorem from a set of axioms.

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A polyhedron with a polygonal base and lateral faces that taper to an apex.

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The distance from the center of a circle to any point on its circumference.

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A part of a line starting at a particular point and extending infinitely in one direction.

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A 90° angle.

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Do not lie in the same plane.

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A three dimensional solid consisting of all points equidistant from a given point.

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For any angle A between 0° and 180°.

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An assertion that can be proved true using the rules of logic.

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If the denominator of a fraction is 0, then the fraction is undefined.

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A corner point of a geometric figure.

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angles opposite one another at the intersection of two lines.

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