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Line

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the set of all points collinear to two points

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Segment

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two end points and all the points in between them

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Plane

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a flat figure with no thickness that extends indefinitely in all directions

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Ray

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is a line with a single endpoint (or point of origin) that extends infinitely in one direction.

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Acute

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angle whose measure is less than 90

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Vertex

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point in common of two rays that form an angle

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Midpoint

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the middle point of the line segment

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Obtuse

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an angle whose measure is greater than 90 and less than 180

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Complementary

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the sum of two angle use measure is 90

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Supplementary

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the sum of two angle whos measure is 180

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Angle

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two non collinear rays with a common endpoint

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Perpendicular

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lines that meet at a 90

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Vertical

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Two non adjacent angles formed by two intersecting line

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Straight

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angle formed by opposite rays

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Congruent

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geometric elements of equal measure

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Quadrant

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four parts of a coordinate plane

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Coplanar

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points that lie on the same plane

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Origin

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point where the x-axis and y-axis meet in a coordinate grid

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Colinear

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points on the same line

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Adjacent

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two angles with a common side but no common interior points

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Point

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A precise location or place on a plane. Usually represented by a dot.

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Dimensions

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a property of space; extension in a given direction:

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Parallel

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coplanar lines that do not intersect or two lines that are always the same distance apart and never touch

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Quadrilateral

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a polygon with four edges (or sides) and four vertices or corners.

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Circle

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flat shape with all points the same distance from its center.

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Face

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is a flat (planar) surface that forms part of the boundary of a solid object;

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Edge

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a line segment where two faces meet.

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Solid

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3 dimensional figure

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Prism

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a solid geometric figure whose two end faces are similar, equal, and parallel rectilinear figures, and whose sides are parallelograms.

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Diameter

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any straight line segment that passes through the center of the circle and whose endpoints lie on the circle.

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Radius

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is the length of a line segment from its center to its perimeter.

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Perimeter

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The distance around a two-dimensional shape.

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Circumference

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is the distance around the circle. It is the circle's perimeter.

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Area

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The amount of space inside the boundary of a flat (2-dimensional) object.

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3D

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3 dimensions height width and length

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Sphere

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as the set of all points equidistant from a single point in space.

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Surface Area

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The total area of the surface of a three-dimensional object, measured in square units.

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Volume

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is the measure of the amount of space inside of a solid figure, it is measured in cubic units.

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Bisector

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The line that divides something into two equal parts

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Decagon

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ten-sided figure

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Symmetry

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one shape becomes exactly like another when you move it in some way: turn, flip or slide

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Polygon

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a plane figure with at least three straight sides and angles.

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intersecting

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two or more lines that meet or cross at a point

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parallelogram

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quadrilateral with two pairs of parallel sides

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Pentagon

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is a five-sided polygon

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Hexagon

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is a six-sided polygon

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Heptagon

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is a seven-sided polygon

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Octagon

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is a eight-sided polygon

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Nanogon

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is a nine-sided polygon