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Square

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A quadrilateral with 4 equal sides and 4 right angles.
Opposite sides are parallel.

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Rectangle

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A Quadrilateral with 4 sides and 4 right angles.
Opposite sides are parallel.

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Triangle

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A polygon with 3 sides and 3 angles.

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Circle

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A polygon made with a continuous line which is always the same distance from the center.

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Line

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A straight path that goes without end in two directions.

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Ray

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Part of a line that has one end point and goes in one direction without end.

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Line Segment

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Part of a line with two end points.

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Angle

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Two rays with the same end point.

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Right Angle

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An angle that is 90 degrees (It makes a square in the corner).

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Side

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Line segments of a polygon.

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Vertex

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The point where two sides meet. (Shared end points of the line segments of a polygon.)

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Quadrilateral

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A polygon with 4 sides and 4 angles.

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Parallelogram

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A quadrilateral (4 sides & 4 angles) where opposites sides are parallel. (ie: Rectangle, square, rhombus, & diamond are parallograms)

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Trapezoid

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A quadrilateral (4 sides & 4 angles) with one pair of parallel sides.

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Rhombus

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a parallelogram with four equal sides and equal opposite angles.

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Equilateral triangle

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A triangle that has 3 equal sides.

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Isosceles Triangle

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A triangle that has 2 equal sides.

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Right Triangle

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A triangle that has one right angle. It can also be an isosceles or scalene triangle.

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Scalene Triangle

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A triangle that has no equal sides. All 3 sides are different lengths.

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Congruent

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A plane figure with the same size and shape.

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Symmetry

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A plane figure that can be folded along a line so the two parts match.

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Line of Symmetry

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The line that divides two matching parts. It can be vertical, horizontal, or diagonal.

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Perimeter

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The distance around the figure.

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Area

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The size a surface takes up, measured in square units.

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Rectangular Prism

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A solid shape that has: 6 faces (4 rectangles & 2 squares), 8 vertices (corners), and 12 equal edges.

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Cube

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A solid shape that has: 6 square faces all equal in size, 8 vertices (corners), and 12 equal edges.

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Sphere

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A solid shape that is perfectly round like a ball. No faces, edges, or vertices.

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Cone

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A solid shape with a circular base and a curved surface that come to a point (vertex).

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Cylinder

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A solid shape with one curved surface and two congruent circular bases.

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Pyramid

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A solid shape with a polygon as a base and triangular faces that come to a point (vertex or apex)

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Volume

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The amount of space occupied by a 3D object, measured in cubic units.

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Face

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The flat surface of a 3D shape.

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Edge

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Where two surfaces join (intersect).

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Plane

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A flat surface.

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Plane shape

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A flat closed shape having only 2 dimensions.

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Plane figure

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A flat figure that can be closed or not closed.

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point

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A dot that specifies only location; it has no length, width, or depth. We usually represent a it with a dot on paper, but the dot we make has some dimension, while a true point has dimension 0.
. B (point B)

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Perpendicular Lines

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Two lines that intersect to form right angles