a five-sided polygon.?
441947
pentagon DUH! lol sry (Hexagon is SIX!)im in geometry rite now so yea
302936
Without knowing the measurements of the sides, you can only figure this out if all sides of the polygon are equal in length. And this is how...\n\nSee, first you draw any polygon, except a triangle. So before doing it, you should know that all the angles of a triangle must add up to 180 degrees. (You can do it with a triangle too, but you would be using what you’re hoping to discover.) From the center of the polygon, draw a line to each vertex. This will create a number of triangles, inside the polygon, equal to its number of sides. Knowing that the angles inside each triangle must add up to 180 degrees, you simply multiply 180 by the number of triangles, which is also the number of sides. Then, realizing that the angles in the center of the polygon, which do not contribute to the angles of that polygon, form a complete circle, and therefore must add up to 360 degrees, you subtract 360 from the result. So the angles in any polygon must add up to 180x-360, or 180(x-2), where x is the number of sides. To find the measure of each angle, in a polygon where all sides and angles are equal, you divide that by the number of sides. The equation then works out to (180(x-2))/x.
588234
Polygons are many-sided figures, with sides that are line segments. \n\nPolygons are named according to the number of sides and angles they have. The most familiar polygons are the triangle, the rectangle, and the square. A regular polygon is one that has equal sides. \n\nPolygons also have diagonals, which are segments that join two vertices and are not sides.\n\nFor more details you can visit the maths site given below:
703879
This sounds like plane geometry where you have an n sided polygon and want to know how many diagonals you can draw.  From each vertex, you can draw a diagonal to every other vertex except to yourself and the two next to you (those two line make sides of the polygon not diagonals).  So for n sides (which means n vertices), you can draw n-3 diagonals at each vertex.  This gives (n-3)*n.  But this just counts the starting end of each line. Whenever you draw one of these lines, it goes to another vertex.  If we drew (n-3)*n lines, we would traces over each diagonal twice, once from each end so there are only half as many diagonals as that.\n\nThe answer then is: (n-3)*n/2
715239
Triangle, quadrilateral, pentagon, hexagon, heptagon, octagon, nonagon, decagon
598810
a regular polygon has the same angles and sides while a irregular one has different sides and angles.
1038080
tetracontaheptagon\n\nhttp://en.wikipedia.org/wiki/Polygon\n\ncheck ya later ♥
424627
11 - undeca\n\n12 - dodeca\n\nEX:\n\nundecagon - polygon with 11 sides.\n\ndodecagon - polygon with 12 sides.
223610
Basically, why isn't there a rotational symmetry for 5 cells in a circle? Because there is no way you can have a single elementary cell that repeats itself covering all of the plane.\n\nTry filling a sheet of paper completely with identical cells of even-sided triangles, squares (and diamond shapes) or hexagons: no problem. Trying to do so with any other regular polygon will leave gaps. Hence only rotations with 2, 3, 4 or 6 periods will result in a lattice.
1052606
A minimum of 3 - where the three polygons are all equilateral triangles.\nIf they are all different, then a minimum of 5 - a regular pentagon.\n\nThe maximum number of sides which the largest polygon could have is ∞ that is a circle.\n\nThe limiting factor (assuming we are talking 2 dimensions) is that the sum of the internal angles does not exceed 360°.\nThe circle's internal angle approaches 180°. the other two regular polygons could be two squares or an equilateral triangle with either another triangle, a square or a regular pentagon.
1131299
Well, a circle does have a side.  It is a continuous set of points that are all equidistant from a common point, thus giving it one side.
293695
It is a triangular prism. It has 5 faces, 9 edges, and last but not least 6 vertices. There is your answer you have been waiting for this whole time!
1092713
triskaidecagon\n\nor a 13-sided polygon, haha.\n\nCheck the source for polygon names from 1-20 sides  :)
50989
Eleven if you count the two adjacent sides of the polygon, otherwise nine.\n\nThinking outside the box answer:\nUnlimited if one does not limit themselves to the other vertices as termini.
416560
You should be able to picture it. Or at least, find a D+D player and look at a 12-sided die.\n\nOne half of this is a pentagon, surrounded on each of the 5 edges by other equal-sized pentagons.  The pentagon has 5 edges, and from each of the five corners is another edge which reaches to the 'equator' of the thing.  The bottom half is identical, with anoth 10 edges just like the flipside. Finally, around the 'equator', is another 5 edges.\n\n25 edges.  Don't need formulas, just good 3-D visualization skills.\n\nPS  It's 'polyhedron', by the way.  Polyhedra is plural.  Saying 'a polyhedra' is just like saying 'a women'.
514188
(1) Straight-sided shapes are called polygons \n\n(2) Others are classified according to the number of sides they have.\na) triangles ( three sides) \nb) quadrilaterals ( four sides) \nc) pentagons (five sides)\nd) hexagons (six sides),\ne) octagons (eight sides)
636579
Okay, I got something really different, but it might be wrong, I used tangents and stuff to figure it out, and I assumed a dodecagon had 12 sides, but I might be wrong. Anyways, I got 38.4 for the perimeter, and 115.2 for the area.