for example squares, circles, trapezoid
209086
First off...there is a lot more. Second...Sorry I didn't supply more.\n\n\nPOLYGONS\nbicentric polygon \nconcave polygon \nconstructible polygon \nconvex polygon \ncyclic polygon \ndecagon \ndodecagon \nenneagon \nequiangular polygon \nequilateral polygon \nhendecagon \nheptagon \nhexagon \nLemoine hexagon \nTucker hexagon \nicosagon \nswastika \noctagon \npentagon \ncyclic pentagon \nregular polygon \nregular decagon \nregular dodecagon \nregular hendecagon \nregular hexagon \nregular icosagon \nregular octagon \nregular pentagon \nstar figure \nstar of Lakshmi \nstar polygon \ndecagram \ndodecagram \noctagram \nheptagram \nstar of David, hexagram \nstar of Goliath, nonagram \npentagram \ntriangle \nacute triangle \nanticomplementary triangle \nequilateral triangle \nexcentral triangle, tritangent triangle \nisosceles triangle \nmedial triangle, auxiliary triangle \nobtuse triangle \nrational triangle \nright triangle \n30-60-90 triangle \nisosceles right triangle \nscalene triangle \nReuleaux triangle \nparallelogram \nequilateral parallelogram: rhombus \nLozenge \nrhomboid \nWittenbauer's parallelogram \nPenrose tile \nPenrose dart \nPenrose kite \nrectangle \nrhombus, diamond \nHarborth's tile \nsquare \ntrapezium \nisosceles trapezium \nquadrilateral \ncyclic quadrilateral, tetrachord, chordal tetragon\nBrahmagupta's trapezium \nequilic quadrilateral \nkite \nrational quadrilateral \nstrombus \ntangential quadrilateral, tangential tetragon\ntrapezoid \nisosceles trapezoid \npolydrafter \n\nCURVED\nannulus \narbelos \nbulb \ncircle \ndisc \nArchimedes' circle \nBankoff circle \ncircumcircle \nexcircle \nincircle \nnine-point circle \ncircular sector \ncircular segment \ncrescent \nlune \nReuleaux polygon \nrotor \nlens, fish bladder, vesica piscis \nReuleaux triangle \nsphere \nsalinon \nsemicircle \ntriquetra \nYin-Yang \n\nNOT COMPOSED OF CIRCULAR ARCS\nArchimedean spiral \nastroid, paracycle, cubocycloid \ndeltoid \nellipse \nsmoothed octagon \nsuper ellipse \ntomahawk \n\nMISC (too lazy to classify)\nTorus\nWhitney umbrella\nCyclide\nMonkey saddle (don't ask, it's real)
110066
http://www.mathleague.com/help/geometry/polygons.htm
168335
It is named "magic square" and they are very well investigated.\nExapmple of it's history and other information is, for example, in the first attached wiki article.\n\nThere are 275,305,224 such 5x5 squares.\nMethods for building them can be found in a references of this wiki article.\nFor example, 2nd attached URL is a link to an application, which can generate you a lot of them.\n\nNow, some examples:\n\n01 02 17 23 22\n19 15 08 16 07\n20 14 13 12 06\n21 10 18 11 05\n04 24 09 03 25\n\n\n01 02 17 23 22\n20 16 08 15 06\n19 12 13 14 07\n21 11 18 10 05\n04 24 09 03 25\n\n\n01 02 17 23 22\n20 16 08 15 06\n21 12 13 14 05\n19 11 18 10 07\n04 24 09 03 25\n\n\n01 02 17 23 22\n21 15 08 16 05\n19 14 13 12 07\n20 10 18 11 06\n04 24 09 03 25\n\nand so on
198365
If a rhombus is inscribed in a circle, then the rhombus is a square.  (Remember that a square is a rectangle with congruent sides, or a rhombus with congruent angles.)\n\nIf a trapezoid is inscribed in a circle, then the trapezoid is an isosceles trapezoid.
427782
You can find a bunch of them in this website:\nhttp://www.mathpuzzle.com/
118582
Yes, if the circles are congruent.
169534
Disagree.  You can have a square that has sides of 8 inches and another with sides of 3 inches.  They are similar because the angles are congruent, and the sides are in proportion, but they are NOT congruent figures.  (Same SIZE and shape).  If two polygons are congruent, then their sides are in a scale factor of 1:1 and their angles are congruent, thus they are similar also.
243099
Imagine the square of string:\n\nWhat will you do to make it a circle? You would have to bend the sides to form an arc like the way you would bend an archer's bow. For it to become a circle, you have to bend the four sides equally so that the corners will no longer be present.\n\nSo your new circle now will have an area bigger than the square. If you overlap the 2 figures together, you would have a big circle and inside it is a square whose 4 corners touch 4 equidistant points on the circle.\n\nArea of the circle: 64/pi OR 20.3718
310773
a) isoceles\nb) hexagon\nc) hemisphere\nD) equilateral\ne) \nf)\nG) sphere or spherical\nh)\ni)\nj) scalene\n\nthese are the ones i know. next time, do your own homework!
337299
maybe a hexagonal prism http://en.wikipedia.org/wiki/Hexagonal_prism http://en.wikipedia.org/wiki/Prism_%28geometry%29
588357
a circle is meant to be round with same radius\na circle of triangular or some other shape is not possible \nif a circle is changed to tringular shape then it is a triangle but not a circle
550054
OK, I think what you're saying is that all the corners have to be colored and that if you can rotate a square to superimpose it on another square, or if they're mirror images, then they're the same.  You didn't say that all colors have to be used, so I'll assume they don't.  That said...\n\nStart with squares in which all four corners are the same color.  There are obviously 4 of these.\n\nNow take squares in which three corners are one color and the fourth is different.  There are 12 of these (three squares can be any of four colors, and the odd one can be any of the other three.)\n\nNext, take squares in which two corners are one color and two are another.  There are six color combinations (red-white, red-blue, red-green, white-blue, white-green, blue-green) and each one can have two patterns:  either the same-colored corners are next to each other, or they're diagonally opposite.  So there are 12 of these.\n\nNext, consider square in which two corners are the same and the others are two different colors.  For each combination of a major (2-corner) color and two minor colors, there are only two patterns:  same colors adjacent and same colors opposite.  Whichever way you arrange the odd colors, it will be the mirror image of the other way and therefore identical.  So for each major color, you can pick any two of three minor colors.  This is the same as leaving out any one, so there are three options for minor colors.  4*3*2 patterns is 24 different squares.\n\nFinally, consider squares in which each corner is a different color.  Now, pick a color and a corner.  Two of the other colors will be adjacent to that corner, and one will be diagonally opposite.  For any choice of opposite colors, either arrangement of adjacent colors will just make another mirror image.  So the only choice here is which color will be opposite.  That means there are three different 4-color squares.\n\nNow, add it all up: 4 one-color squares, (12 + 12 =) 24 two-color squares, 24 three-color squares, and 3 four-color squares, equals 55 unique squares.
242727
Use Google. \n\nIt's a pentacle when it's only the star and a pentagram when there's the circle around it.
395556
Try Google or Yahoo.  You'll find worked examples there.  I think it needs diagrams to understand; they and the accompanying explanations are too complex to attempt to reproduce here.
489251
It is said that the area of a circle is Pi R square.  Pie are not square. Pie are round, cornbread are square.
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These pics will give you some ideas --> http://images.google.com/images?hl=en&q=cell+model&btnG=Search+Images
21928
Green Circle (easy)\nBlue Square (intermediate)\nBlack Diamond (expert)\nDouble Black Diamond (expert only!)