Mathematics
A parallelogram will not be a rhombus if :
sum of its opposite angles is 180°
its adjacent sides are equal.
its diagonals are perpendicular to each other.
each diagonal bisects the angles of the vertices.
Quadrilaterals Constructions
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Answer
A parallelogram will not be a rhombus if the sum of its opposite angles is 180°.
Hence, option 1 is the correct option.
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