what is a 12 sided shape called?
137782
A two dimensional figure is called a dodecagon and a 3D figure with 12 sides is called a dodecahedron.
826187
I am guessing you want the vector projection onto one of the 6 sides rather than one of the 12 edges.\n\nThe diagonal vector is (1, 1, 1).  Projecting it onto any side simply removes the coordinate in the direction of projection.  Projecting it onto the side in the xy plane gives (1, 1, 0). \n\nIf you did mean an edge (the line where 2 sides meet), then the projection is always two 0s and a 1.  The one is in the direction of the edge.
476849
a pentagon, or a regular pentagon, depending on if all the sides & angles are equal or not. hope that helped.
1112455
You might be thinking of a Reuleaux (or Rouleaux) triangle, but it has rounded sides, not rounded corners.
63969
A hexagon has 6 sides.
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'.
566727
I'm afraid that with the given information, this would be impossible to determine. The only thing one could conclude from this information is that this polygon has an even number of sides. \n\nIt could be a square with sides of 3cm each\nIt could be a hexagon with sides of 2cm each\nIt could be an octagon with sides of 1.5cm each\nIt could be a decagon with sides of 1.2cm each\nIt could be a 12-gon with sides of 1cm each\n\nThe list is infinite unless you are given more specific information, such as the length of each side or the angles within the shape.
1092713
triskaidecagon\n\nor a 13-sided polygon, haha.\n\nCheck the source for polygon names from 1-20 sides  :)
613272
could be circle because it doesn't have any sides or angles\n\ncould be rectangle because it is not proportional (side-wise.. and only if the triangle is equilateral)\n\ncould be triangle because if all shapes are placed right-side and divided into four equal parts, like a cross-hair, the triangle is the only one without equal portions.
792270
Hi I assume you mean an unsymmetrical item. I also assume you want a best fit. I have done similar things on a computer but not by hand. The computer finds three point most distant from the centroid and uses these points as pivots for three orthogonal planes. Not sure of the rest.
464336
HEPTAGON - a seven-sided polygon.\n\nTRIANGULAR PYRAMID - a pyramid with a triangular base and 3 triangular faces.\n\nSCALENE TRIANGLE - a triangle none of whose sides have equal length. The angles don't have the same measures, too.\n\nISOSCELES TRIANGLE - a triangle 2 of whose sides have equal measures. Therefore, the angles opposite the congruent sides have equal measures also.\n\nEQUILATERAL TRIANGLE - a triangle all of whose sides have equal measures. The angles have equal measures, too.\n\nRIGHT TRIANGLE - a triangle 1 of whose angles has a measure of 90 degrees. The other 2 angles have measures that are less than 90 degrees. The side opposite the 90-degree angle is the longest side and is called the hypotenuse. The other sides are called legs.\n\nSPHERE - is shaped like a ball (round).\n\nCONE - it is a pyramid with a circular base.\n\nDECAGON - a polygon with 10 sides.\n\nDODECAGON - a polygon with 12 sides.
592569
Spheroid, ovoid, globate, globular.  The most commonly used word would be egg-shaped, but I know what you mean-an egg isnt really oval, unless you are speaking about an ant egg.  I have seen ovoid used for this kind of shape more often than any other (besides "egg-shaped").\n\n*edit* an ellipsoid can also be a perfect sphere, depending on the axes.  The perfect description for a three-dimensional oval is a *prolate spheroid*, but I have never in my life heard the term until I went searching for the answer to this question.  If you follow the Wikipedia link on ellispoid to the bottom, you see that it descibes a wide range of 3D shapes, including spheres- The link to prolate spheroid shows a shape limited only to perfect 3D ovals.\n\nhttp://en.wikipedia.org/wiki/Spheroid
787617
(m)\n\n14 sides: tetradecogon
908743
A regular 2D polygon with 13 vertices is called a triskaidecagon.  There are no regular 3D polyhedron with 13 vertices.  There exists a polyhedron with 13 vertices and 11 faces, an augmented hexaongal prism, but mathematically studied polyhedra with 13 vertices are very rare.
53700
Ten. It's greek and means "ten angles", so that there are also ten sides.
671808
4 sides and corners in a square
907794
any closed 4 sided figure;