home.btconnect.com/shapemakingclub/twodimensionalshapes.html
Use this link. It will teach you more than just a 20 sided polygon.
The special features of 3D shapes are they all are 3D which means they are fat but 2D shapes are flat they can not stand up.
They are both 2D shapes and have exterior angles that add up to 360 degrees
Yes. Corners is simply the more casual term. * * * * * Yes, but not all 2D shapes - a circle or an ellipse, for example, have corners. Nor does an irregular curved line that closes up on itself.
No, two-dimensional shapes do not have faces in the way three-dimensional objects do. Faces are flat surfaces that make up the boundaries of 3D shapes. In contrast, 2D shapes, such as squares or circles, have only length and width, existing on a single plane without depth.
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The special features of 3D shapes are they all are 3D which means they are fat but 2D shapes are flat they can not stand up.
Organic shapes don't have names. They are random shapes that you make up.
They are both 2D shapes and have exterior angles that add up to 360 degrees
Triangle Quadrilateral Pentagon Hexagon Heptagon Octagon Nonagon
Yes. Corners is simply the more casual term. * * * * * Yes, but not all 2D shapes - a circle or an ellipse, for example, have corners. Nor does an irregular curved line that closes up on itself.
No, two-dimensional shapes do not have faces in the way three-dimensional objects do. Faces are flat surfaces that make up the boundaries of 3D shapes. In contrast, 2D shapes, such as squares or circles, have only length and width, existing on a single plane without depth.
No. If you can pick it up, it has depth (even a millimetre). This means it is 3D. A piece of paper is a very thin cuboid. 2D can only be represented by drawings, images on paper etc., not the paper itself.
2D is a shape or an object that is flat and u can not pick it up, and it has 2 faces. 3D is a shape or an object that is a shape and you cant pick it up and hold it, and it can have as many faces.
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The angles around the vertexes of a truncated icosahedron (120+120+108) do not add up to 360 because they are not all in the same plane, ie. the polyhedron is a 3D structure not 2D. If the vertex is projected onto a 2D surface the angles become 124:20 +124:20 +111:20 which do add up to 360. Anyone with an IQ greater than their shoe size would know this :-)
A shape is typically defined by its dimensions, which indicate the extent of its geometry in space. The most common dimensions include one-dimensional (1D) shapes like lines, two-dimensional (2D) shapes like squares and circles, and three-dimensional (3D) shapes like cubes and spheres. In theoretical contexts, shapes can also extend to higher dimensions, such as four-dimensional (4D) shapes, but these are less commonly encountered in everyday experiences. Thus, the number of dimensions that make up a shape can vary depending on its classification.