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.
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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Triangular based pyramid with no bottom. That is, if you meant 3-D shapes, presumably?
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.
yes
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A cube.
it's shapes that are 3-d like they look like real objects who have realistic figures as in real life
Sphere, cuboid, tetrahedron.
There are many 3-D shapes (including ones that don't have names). Here are the commonly known 3-D shapes in general: -hemisphere -cube -cuboid -tetrahedron -cylinder -octahedron -cone -prism -sphere -pyramid -dodecahedron
They are alike because they are both 3-D shapes