Shapes

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 * Shapes**
 * Quadrilateral** - a shape with four sides (lsv) [|www.mathisfun.com/quadrilaterals.html]
 * Parallelogram -** a quadrilateral having both pars of opposite sides parallel to each other (lsv) [|www.mathwarehouse.com/geometry/quadrilaterls/parallelograms/]
 * Rectangle -** a parallelogram having four right angles (lsv) [|www.coolmath.com/reference/rectangles.html]
 * Square** - a rectangle having four sides of equal length (lsv) [|www.webmath.com/geo_square.html]


 * Size**
 * Perimeter** - the border or outer boundary of a two-dimensional figure (lsv) [|www.mathgoodies.com/lessons/vol1/perimeter.html]

=**Shapes**=
 * Space**
 * Path** - a continuous curve that connects two or more points (lsv) [|www.mathworld.wolfram.com/Billiards.html]
 * Pentagon**-A plane figure with five straight sides and five angles.(jdp)
 * Cylinder**-A solid geometric figure with straight parallel sides and a circular or oval section.(jdp)
 * Polygon**-A plane figure with at least three straight sides and angles, and typically five or more.(jdp)
 * Square**- In geometry, a //square// is a regular quadrilateral. This means that it has four equal sides and four equal angles (90-degree angles, or right angles). (jdp)

[|Polyhedron]- A //polyhedron// is a geometric solid in three dimensions with flat faces and straight edges. (mkm)

Rhombus
A four-sided polygon having all four sides of equal length. The sum of the angles of a rhombus is 360 degrees. (cjh)

A circle is the collection of points in a plane that are all the same distance from a fixed point. The fixed point is called the center. A line segment joining the center to any point on the circle is called a radius. (cjh)
 * Circle**

Trapezoid
A four-sided polygon having exactly one pair of parallel sides. The two sides that are parallel are called the bases of the trapezoid. The sum of the angles of a trapezoid is 360 degrees. (cjh)

Parallelogram
A four-sided polygon with two pairs of parallel sides. The sum of the angles of a parallelogram is 360 degrees. (cjh)

__Regular Polygon__- A two-dimensional shape made up of straight lines that are all connected. They are closed shapes that have all equal angles and all equal sides. (JMG) __Equilateral Triangle__- A triangle with three equal sides and three equal angles, always 60 °. (JMG)

__Obtuse Triangle__- A triangle which contains an angle that is more than 90 °. (JMG)

__Quadrilateral__- A closed two-dimensional shape with four straight sides. There are a number of different types of quadrilaterals like squares, rectangles, parallelograms, rhombus, etc. (JMG)

__[|Pentagon]__ - Any five-sided polygon. (MLS)

__[|Hexagon]__ - Any six-sided polygon. (MLS)

__[|Octagon]__ - Any eight-sided polygon. (MLS)

__[|Nonagon]__ - Any nine-sided polygon. (MLS)

A seven-sided polygon. The sum of the angles of a heptagon is 900 degrees. []
 * Heptagon (fdy)**

A figure is convex if every line segment drawn between any two points inside the figure lies entirely inside the figure. A figure that is not convex is called a concave figure. []
 * Convex (fdy)**

An angle bisector is a ray that divides an angle into two equal angles. []
 * Angle Bisector (fdy)**

A triangle having three sides of different lengths. []
 * Scalene Triangle (fdy)**

[|Cube] - a box-shaped solid object that has six identical square faces (hld)

[|Prism]- a solid object that has two identical ends and all flat sides (hld)

[|Sphere] - a 3-dimensional object shaped like a ball (hld)

[|Pyramid] - a solid object that has the base of a polygon and the sides are triangles which meet at the top (hld)

[|Rectangular Prism] A 3-dimensional object which has six faces that are rectangles. (JRP)

[|Semicircle] A two-dimensional geometric shape that forms half of a circle, the arc measuring 180 degrees. (JRP)

[|Cylinder] A 3-dimensional object with two identical flat ends that are circular or elliptical and one curved side. It has the same cross-section from one end to the other. (JRP)

[|Cone] A solid figure that has a circular base and comes to a point called the vertex. (JRP)

[|Vertex/Vertices] A point where two or more sides of a plane or solid figure meet. (rec)

[|Line of Symmetry] An imaginary line that divides a shape into halves that are reflections of each other. (rec)

[|Face] A flat surface of any shape on a solid figure. (rec)

[|Plane Shape] A flat shape with sides and vertices. (rec)

[|Right Triangle]- A triangle that has one interior angle the measures at exactly 90 degrees. The other two interior angles must be acute angles. (mnj)

[|Irregular Polygon]- A closed, straight-edged, two-dimensional shape whose sides are not all equal lengths.(mnj)

[|Acute Triangle]- A triangle where all three interior angles measure less than 90 degrees.(mnj)

[|Decagon]- A ten-sided polygon (mnj)

[|Dodecagon] - A twelve sided polygon (JLH)

[|Tetrahedron] - A polyhedron composed of four triangular, three of which meet each vertex (JLH)

[|Icosahedron]- A polyhedron composed of 20 equilateral triangular faces (JLH)

[|Tesselation] - The repeated pattern of a shape or shapes, tiling a plane and leaving no gaps (JLH)

Cuboid- a box shape in three dimensional space (JPL) http://www.mathwords.com/r/rectangular_parallelepiped.htm

Oval- an egg-shaped curve (JPL) http://www.mathwords.com/r/rectangular_parallelepiped.htm

Ellipse- a conic section which is essentially a stretched circle (JPL) http://www.mathwords.com/e/ellipse.htm

A Right Regular Pyramid- a right pyramid with a base that is a regular polygon (JPL) []


 * Balbis** -A single (primary) line that is terminated by a (secondary) line at one endpoint and by a (secondary) line at the other endpoint. The terminating secondary lines are at right angles to the primary line. Its parallel sides are of indefinite lengths and can be infinitely long. Best describe as the letter H. (rj)

[]
 * Regular Dodecagon** - A shape having twelve sides of equal length and all angles equal 150 degree. (rj).

[] (rj).
 * Polygon**- A polygon is a closed figure made by connecting line segments, where each line segment end connects to only one end of two other line segments.

(rj)
 * Tetrahedron**- is a polyhedron with four sides. if all faces are congruent, the tetrahedron is known as an isosceles tetrahedron. If all faces are congruent to an equilateral triangle, then the tetrahedron is known as a regular tetrahedron (although the term "tetrahedron" without further qualification is often used to mean "regular tetrahedron"). A tetrahedron having a trihedron all of the face angles of which are right angles is known as a trirectangular tetrahedron.


 * Edge -** the intersection of faces in three dimensional figure. http://www.icoachmath.com/math_dictionary/Edge.html (jpb)


 * Arc -** a portion of the circumference of a circle. http://www.mathopenref.com/arc.html (jpb)


 * Vertex -** a point where two or more straight lines meet. http://www.mathsisfun.com/definitions/vertex.html (jpb)


 * Plane -** a flat surface that infinitely large with zero thickness. http://www.mathopenref.com/plane.html (jpb)