Pentagon - Wikipedia, the free encyclopedia
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In geometry, a pentagon is any five-sided polygon. A pentagon may be simple or self-intersecting. The internal angles in a simple pentagon total 540°. The term pentagon is commonly used to mean a ...
en.wikipedia.org/wiki/Pentagon
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Regular polygon - Wikipedia, the free encyclopedia
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A regular polygon is a polygon which is equiangular (all angles are equal in measure) and equilateral (all sides have the same length). Regular polygons may be convex or star . These properties ...
en.wikipedia.org/wiki/Regular_polygon
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Inscribing a regular pentagon in a circle – and proving it. Straightedge and compass construction ... To verify the construction, look first at the "star pentagram", a regular pentagon containing a five-pointed star inscribed within it (Figure 2). Consider the two diagonals radiating from a single vertex.
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www.cut-the-knot.org/pythagoras/pentagon.shtml
www.cut-the-knot.org/pythagoras/pentagon.shtml
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Commonly, the term "pentagon" is used to refer to the regular pentagon. ... The regular pentagon is the regular polygon with five sides illustrated above. ...
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mathworld.wolfram.com/Pentagon.html
mathworld.wolfram.com/Pentagon.html
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Regular Polygon ... A regular pentagon: ... Polygon; Regular polygon; Vertex; Triangle; Equilateral triangle; Isosceles triangle; Scalene triangle; Acute triangle; Obtuse triangle; Right triangle; Quadrilateral; Rectangle; Square; Parallelogram; Rhombus; Trapezoid; Pentagon; Hexagon; Heptagon; Octagon; Nonagon; Decagon;
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www.mathleague.com/help/geometry/polygons.htm
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This applet illustrates what a regular pentagon is. ... Regular polygon ... Privacy Policy © 2003-2009 The Math Forum @ Drexel, part of NSF's NSDL Tool Thumbnail...
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mathforum.org/mathtools/tool/1294/
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What are the reasons for the steps in inscribing a regular pentagon within a circle with only the help of a compass and a straightedge? ... Inscribing a Regular Pentagon within a Circle...
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mathforum.org/library/drmath/view/55113.html
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