in the real world geometry
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Geometry In The Real World
By Nick Holt Block 1 A-day
12/11/09
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Point
• An undefined term in geometry, it names a location and has no size
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Line
• An undefined term in geometry, a line is a straight path that has no thickness and extends forever.
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Plane
• An undefined term in geometry, it is a flat surface that has no thickness and extends forever.
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Angle
• A figure formed by two rays with a common endpoint.
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Perpendicular lines
• Lines that intersect at 90 degree angles.
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Parallel lines
• Lines in the same plane that do not intersect.
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Triangle
• A three sided polygon.
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Right Triangle
• A triangle with one right angle.
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Pentagon
• A five-sided polygon.
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Hexagon
• A six-sided polygon.
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Square
• A quadrilateral with four congruent sides and four right angles.
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Rectangle
• A quadrilateral with four right angles.
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Trapezoid
• A quadrilateral with exactly one pair of parallel sides.
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Parallelogram
• A quadrilateral with two pairs of parallel sides.
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Circle
• The set of two points in a plane that are a fixed distance from a given point called the center of the circle.
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Cylinder
• A three dimensional figure with two parallel congruent circular bases and a curved lateral surface that connects the bases.
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Sphere
• The set of points in space that are a fixed distance from a given point called the center of the sphere.
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Cube
• A prism with six square faces
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Regular pyramid
• A pyramid whose base is a regular polygon and whose lateral faces are congruent isosceles triangles.
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Right cone
• A cone whose axis is perpendicular to the base.