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Mathematics in Senior Two: the definition and characteristics of rhombus, how to identify rhombus?
Definition: A set of parallelograms with equal adjacent sides on a plane is a diamond.

Property: 1, diagonal lines are perpendicular to each other and bisected, and each diagonal line bisects a set of diagonal lines.

2. All four aspects are equal.

3. Diagonal angles are equal and adjacent angles are complementary.

4. The diamond is not only an axisymmetric figure, but also a centrally symmetric figure.

5.60 rhombus, the short diagonal is equal to the side length, and the long diagonal is √3 times of the short diagonal.

6. The diamond is a special parallelogram, which has all the properties of a parallelogram.

Features: the midpoint of each side of the connected rhombus is a rectangle and the square is a special rhombus, and the rhombus is not necessarily a square. Therefore, a figure with four equilateral sides on the same plane is not just a square.