It is a 3 dimensional object that has density and volume
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It is often referred to as a "net." In higher-level mathematics, especially topology, the word "surface" can be used.
Mathematics"mathematics" is a plural noun already, the subject is Mathematics!
Objects that exist in the real world usually have shapes (although they can also be shapeless) and those shapes will bear some resemblance, and in some cases a very close resemblance, to the theoretical shapes of plane and solid geometry, such as triangles, squares, circles, spheres, cubes, etc. But even aside from that, a deep understanding of our universe (and the laws of nature which describe the way it operates) would not be possible without a knowledge of plane and solid shapes. Geometry has implications for every area of mathematics, and mathematics is the language of science.
It depends on what you mean. If you mean "more likely to fail chemistry and physics than to fail mathematics", then the answer is presumably yes. If you mean "more likely to fail chemistry and physics than some bozo who can't figure out how this 'multiplication' thing works", then no. In physics and (most kinds of) chemistry, a solid understanding of mathematics can only be helpful.
mathematics