China Naming Network - Solar terms knowledge - What properties of parallelogram are used to make iron gates?

What properties of parallelogram are used to make iron gates?

In fact, the grating gate is made of the properties of diamonds. The four sides of the parallelogram on the grating door are all equal, and they are parallel no matter how they expand or contract. According to the discrimination method of diamond, a group of parallelograms with equal adjacent sides are diamonds. The grating gate is made by using the characteristic that all four sides of the diamond are equal.

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