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goldieluxe
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I know cylinder, cone and cube, but can't think of the names for the last two. I know this is a very basic question that I should know...but I am blanking. View attachment 6204
phymat said:Second last one is precisely known as cuboid and the last one is a triangular prism (as MarkFL said).
Prove It said:I don't think there's anything precise with the term "cuboid" as it simply means "cube-like". "Rectangular Prism" is much more specific, as being a 3D shape with all identical rectangular cross-sections...
phymat said:If a name has been given to a 3D shape by ancient mathematicians, why not use it? A square will be called a square, not a rectangle with all sides equal. :)
phymat said:If a name has been given to a 3D shape by ancient mathematicians, why not use it? A square will be called a square, not a rectangle with all sides equal. :)
I like Serena said:From wiki:
In geometry, a cuboid is a convex polyhedron bounded by six quadrilateral faces, whose polyhedral graph is the same as that of a cube. While mathematical literature refers to any such polyhedron as a cuboid,[1] other sources use "cuboid" to refer to a shape of this type in which each of the faces is a rectangle (and so each pair of adjacent faces meets in a right angle); this more restrictive type of cuboid is also known as a rectangular cuboid, right cuboid, rectangular box, rectangular hexahedron, right rectangular prism, or rectangular parallelepiped.[2]
So for starters "cuboid" is somewhat ambiguous, and more specifically mathematical literature refers to it without requiring right angles or square faces, while cube and right rectangular prism are well-defined with square respectively rectangular faces.
phymat said:Does the diagram posted by OP specify right angles or square faces?
Also, how would you define a cuboid?
I like Serena said:Examples of cuboids... I think they look different from what is shown in the OP...
The real names of these 3D shapes are cube, sphere, and cylinder.
We use different names for these shapes to accurately describe their unique characteristics and properties.
A cube is a 3D shape with six square faces, while a sphere is a 3D shape with a curved surface and no edges or vertices.
These 3D shapes are typically classified based on the number of faces, edges, and vertices they have.
Yes, there are many real-life examples of these 3D shapes. A cube can be seen in a Rubik's cube, a sphere can be seen in a basketball, and a cylinder can be seen in a can of soda.