If you can make it just by cutting it out of a piece of paper, it's 2-d. If you can make it by carving a block of wood, it's 3-d. 2-d shapes have length and width, but not height. 3-d shapes have length, width, and height. Here's an example: a rectangle might be 2" long and 5" wide, but those are the only numbers you use, so it's a 2-d shape. A house is 60' long, 25' wide, and 10' tall, so it's 3-d.
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In 2-dimensions, an octagon. In 3-d it could be a heptagonal pyramid, a quadrilateral prism or quadrilateral antiprism. There are probably a few more shapes.
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4D includes smell.
3-d shapes are not made from 2-d shapes. 3-d shapes may have projections onto a plane that are 2-d.
3 dimensional shapes have breadth, width and depth whereas 2 dimensional shapes have only breadth and width
No because isosceles triangles are 2 dimensional shapes.
There are no triangular prisms in faces. Faces are 2-d shapes and these cannot contain 3-d shapes in them.
If you can make it just by cutting it out of a piece of paper, it's 2-d. If you can make it by carving a block of wood, it's 3-d. 2-d shapes have length and width, but not height. 3-d shapes have length, width, and height. Here's an example: a rectangle might be 2" long and 5" wide, but those are the only numbers you use, so it's a 2-d shape. A house is 60' long, 25' wide, and 10' tall, so it's 3-d.
There are no triangular prisms in faces. Faces are 2-d shapes and these cannot contain 3-d shapes in them.
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a cube has parallel faces so does a cuboid and so does a cylinder and also if you want to find out lots more stuff about 3-D shapes or 2-D shapes see the website in the related link
Polygonal (2-d) shapes get their (not there) names from the number of sides; polyhedra (3-d) shapes get their names from the number of faces.The names of other shapes: circles, ellipses, torus, cardioid etc have different origins.
2-D shapes are all named "polygon", in honor of the lost parrot of Plato. 3-D shapes are all named "polyhedron", in honor of the memorable 3-D shape of their cousin Tippi.
Nets
No. A prisim and a pyramid are 2 different 3-D shapes.