A triangle is a closed figure composed of three line segments in the same plane but not on the same straight line. It has applications in mathematics and architecture. Common triangles include ordinary triangle, isosceles triangle, right triangle, acute triangle, obtuse triangle and equilateral triangle.
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Tangram is an ancient traditional intellectual toy in China. As the name implies, it consists of seven boards. Tangram is an invention of working people in ancient China, and its history can be traced back to at least the first century BC.
By the Ming dynasty, it was basically finalized. Ming and Qing Dynasties were widely circulated among the people in China. Qing people wrote in Volume I of Cold Records Miscellaneous Knowledge: There are seven ingenious pictures with five shapes and seven numbers recently, and there are thousands of changes. Things are small in shape, changing at will, and full of games, which are enough to relieve boredom and break the silence, so secular people like them.
Modern intelligence puzzle is a kind of educational toy designed on the basis of traditional puzzles and referring to the principles of modern higher mathematics. Compared with traditional puzzles, the patterns are more vivid and diverse, which can exercise the ability of hands and brains and inspire creative consciousness.
Modern puzzle is a modern "puzzle" developed on the basis of traditional puzzles, which refers to the geometry, topology and linear programming principles of modern higher mathematics. It is composed of seven kinds of irregular plates: round, semicircle, triangle, trapezoid, angular irregular pattern (also called right-angle plate) and round irregular pattern (also called large plate). As shown in the figure: Rule: flip the position where seven boards are placed to complete the puzzle.