Geometry 2Dimensional

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Geometry2-Dimensional 3-Dimensional Shapes

• By Melissa Miller

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Some Helpful Definitions

• Shape The outer form or outline.
• Polygon A closed plane figure bounded by
  straight lines.
• Solid A three-dimensional shape.

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2-Dimensional Shapes
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Circle

• A Circle is a figure bound by a curved line that
  is equally distant from any fixed point.

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Triangle

• A Triangle is a three-sided figure with three
  angles.

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Parallelogram

• A Parallelogram is a four sided figure with
  parallel opposite sides. The figures parallel
  sides are also the same length.
• Can you find the parallelogram in the picture?

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Square

• A Square is a parallelogram with four equal
  sides.
• A Square is a polygon.
• A Square is also a quadrilateral.

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Quadrilateral

• Here are several examples of a Quadrilateral.
• A Quadrilateral is a four-sided polygon.
• Another example.

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Rectangle

• A Rectangle is a parallelogram with opposite
  sides of the same
• All angles are right angles.

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Pentagon

• A Pentagon is a five-sided polygon.

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Hexagon

• A Hexagon is a six- sided polygon.

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Heptagon

• A Heptagon is a seven-sided polygon.

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Octagon

• An Octagon is an eight-sided polygon.

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Nonagon

• A Nonagon is a nine-sided polygon.

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Decagon

• A Decagon is a ten-sided polygon.

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Solids(Three Dimensional Shapes)
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Sphere

• A Sphere is a three-dimensional figure in the
  shape of a circle.
• Every point on its surface is an equal distance
  from the center.

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Cylinder

• A Cylinder is a 3-Dimensional figure with the
  base of a circle
• A Cylinders center moves along a straight line.

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Cube

• A Cube is a 3-Dimensional figure whose faces are
  all squares of the same size.

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Rectangular Prism

• A Rectangular Prism is a 3-Dimensional figure
  with two parallel, matching bases.

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Cone

• A Cone is a 3-Dimensional figure with the base of
  a circle.

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Pyramid

• A Pyramid is a 3-Dimensional figure with one base
  and all sides are triangles.