The most precise name for the quadrilateral ABCD is a Rhombus. In a Rhombus, the diagonals are always perpendicular to each other.
Rhombus is the most precise name for quadrilateral ABCD with vertices A(-1,0), B(4,0), C(5,4), and D(0, 4) because a rhombus is a parallelogram with all four sides of equal length. In a rhombus, the diagonals are always perpendicular to each other, which can be shown using the concept of scalar product of vectors.
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