Which of the following pictures is not a 3D figure.

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answer is D.

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Detailed Solution

The above question is a simple 3-dimensional geometry question. First we would understand the definition of 3-dimensional geometry. In geometry, a three-dimensional shape is defined as a solid figure or object or an object or shape that has three dimensions, which is length, width, height. Unlike a 2-dimensional image, which only has length and width, a 3-dimensional image has thickness or depth. Also, almost all three-dimensional shapes have more than one surface except a sphere, which has only one curved surface.
Now we analyze the option and check whether it is a 3D image or not.
1). We can see that it is a sphere, and as we discussed above, a sphere is a 3D figure with only 1 curved surface.
2). We see that the given figure is a cone that has more than 1 face, that is, it has 1 flat face and one curved face. So it is also a 3D image.
3). We see that the given figure is a cube that has length, width and height. So it is also a 3D image.
4). We see that the given figure is a square, which has only 2 dimensions, i.e. length and width. It is therefore not a 3D figure.
So option (4) is the correct answer.

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