*Which of these options must be true for a parallelogram to be a rhombus?*
1️⃣ Its adjacent sides must be equal
2️⃣ Its adjacent angles must be equal
3️⃣ One of the angles must be 90°
4️⃣ All the angles must be 90°
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4.all angles must be 90°
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Answer:
adjacent sides must be equal of a parallelogram to be a rhombus
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