Information AboutPentagon |
| CATEGORIES ABOUT PENTAGON | |
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In Geometry , a pentagon is any five-sided Polygon . However, the term is commonly used to mean a regular pentagon, where all sides are equal and all angles are equal (to 108°). Its Schläfli Symbol is {5}. The area of a regular pentagon with side length ''a'' is given by A Pentagram can be formed from a regular pentagon either by extending its sides or by drawing its diagonals. The two differ by a linear scale factor φ + 1, or conversely 2 - φ, where φ = (1+√5)/2, the Golden Ratio . The resulting figure contains also many more various other lengths related by the golden ratio. Constructing a pentagon #Put the needle in (b) and pass a circle segment through (c) and the first circle. These points on the first circle are the second and third corners of the pentagon. #Without extending the compass, put its needle in the second and third corners, and draw circle segments passing through the first circle to find the two remaining corners. #Join each corner to the adjacent ones and you have a pentagon. #If you join the non-adjacent corners (drawing the diagonals of the pentagon), you obtain a Pentagram , with a smaller regular pentagon in the center. Or if you extend the sides until the non-adjacent ones meet, you obtain a larger pentagram. SOME RELEVANT TRIGONOMETRIC VALUES : : : : : : : : EXTERNAL LINKS
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