They are located in the Moon's orbit, equidistant from both the Earth and the Moon, with which form congruent equilateral triangles .

他们都位于到月球和地球距离相等的月球轨道上，形成两个等边三角形。

youdao

By means of congruent transformation in matrix, the method of transforming real quadratic form into standard form and the method of normal orthogonal basis are given in this paper.

借助矩阵的合同变换法，给出了化实二次型为标准形的方法、求标准正交基的方法，并给出了正定二次型判定定理的新证明。

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The interface eschews the conventional virtualization of a turntable set-up, instead creating a workflow more congruent with the hardware's form factor.

ENGADGET