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Starting with a rhombus, one vertex is found to be a right angle. Name the most specific resulting shape.

AIt is a parallelogram
BIt is a rhombus
CIt is a square
DIt is a rectangle
Answer & Solution
Correct answer: C. It is a square
A rhombus is a parallelogram, so opposite angles are equal and adjacent angles supplement the right angle. All angles are 90°, making it a square.
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