Triangles are isosceles triangle, equilateral triangle, acute triangle, obtuse triangle, and triangle.

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All meshing elements except those are adjacent to edge and transition elements are equilateral triangle, which is very useful for finite element computation.

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A pressure correction equation is established by use of the finite volume method on nonorthogonal collocated grids, and its algebraic form is also given. The equation is applied to simulation of the flow field in an equilateral cavity and an inclined cavity with a tilt angle of 45°.

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Carried out generalized Mises yield criterion , yield curve on the n flat face was circle curve, and different elected parameters correspond to external angular point circumcircle、 internal angular point circumcircle and incircle of Mohr-Coulomb unequiangular hexagon. According to unequiangular hexagon, circle yield curve which had the same area as hexagon can be found, and corresponding yield criterionwas equilateral circle yield curve.

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According to the angular spectrum theory, the Fraunhofer diffraction light intensity distribution of the equilateral triangle and the equilateral hexagon is calculated by computer, the characteristics of their light intensity distribution is analyzed and contrasted, and it is proved by experiments.

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In addition to creating zone of stability in the Moon's orbit in which to build permanent space habitats, the Lagrange librations points have a unique geometry, such that three of the points form an equilateral triangle and two of those three points form congruent equilateral triangles with the Earth and Moon.

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In addition to creating zone of stability in the Moon's orbit in which to build permanent space habitats, the Lagrange librations points have a unique geometry, such that three of the points form an equilateral triangle and two of those three points form congruent equilateral triangles with the Earth and Moon.

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The equilateral and straight traverse replacing the approximate equilateral and straight traverse is introduced in the paper, so the question of the rational match of the side-angle-weight in the approximate equilateral and straight traverse survey is solved.

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Mainly analyses influence of variant characteristic length under same diffusion distance, and which is the best choice from square, circular, and equilateral triangle. The results show that equilateral triangle is the best.

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