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A closed pattern consisting of successively connecting three segments of a line that are not on the same line is called a triangle. The figure enclosed by three straight lines on the plane or three arcs on the spherical surface, the figure enclosed by the three straight lines is called a plane triangle; the figure surrounded by the three arcs is called a spherical triangle, also called a triangle.
The three closed lines are connected in series, and the closed geometry is called a triangle. The triangle is the basic pattern of the geometric pattern.
The triangular items in life include umbrellas, buntings, lampshades, sails, pavilions, snow-capped mountains, roofs, watermelons cut into triangles, bamboo shoots, pyramids, triangular irons used on machines, certain road signs, Yangtze River Delta, and cable-stayed bridges.