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Minimum angle theorem and maximum angle theorem
Minimum angle theorem: the angle formed by a straight line and a plane is the minimum angle formed by a straight line and all the straight lines in the plane. The line-plane angle is the smallest line-plane angle. Maximum angle theorem: dihedral angle is the maximum angle formed by a straight line in one plane and another plane (dihedral angle is the largest line-plane angle).

Mathematics is a subject that studies concepts such as quantity, structure, change, space and information. Mathematics is a universal means for human beings to strictly describe and deduce the abstract structure and mode of things, and can be applied to any problem in the real world. All mathematical objects are artificially defined in essence. In this sense, mathematics belongs to formal science, not natural science.

Different mathematicians and philosophers have a series of views on the exact scope and definition of mathematics. Mathematics plays an irreplaceable role in the development of human history and social life, and it is also an indispensable basic tool for studying and studying modern science and technology. Mathematics originated from the early production activities of human beings, and ancient Babylonians have accumulated certain mathematical knowledge since ancient times.

And can be applied to practical problems. As far as mathematics itself is concerned, their mathematical knowledge is only obtained through observation and experience, and there is no comprehensive conclusion and proof, but their contribution to mathematics should also be fully affirmed. The knowledge and application of basic mathematics is an indispensable part of individual and group life.

The refinement of its basic concepts can be found in ancient mathematical documents of ancient Egypt, Mesopotamia and ancient India. Since then, its development has continued to make small progress. But algebra and geometry at that time were still independent for a long time.