A rhombus (or rhomb) is a quadrilateral whose four sides all have the same length.
All opposite angles of the rhombus are the same, and the diagonals of the rhombus bisects one another and are perpendicular.

By using the diagonals you can calculate about anything because you have four right equilateral triangles. One angle is half of the whole angle.

You can look up rhombus formulas or even use parallelogram formulas.

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