ABCD is a parallelogram. If its diagonals are equal, then find the value of angle ABC
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Answer: it's 90°.
Step-by-step explanation:
A rectangle (including a square, cause square's a rectangle too) is the only parallelogram having diagonals of equal length. Therefore if we consider a rectangle ABCD with its equal diagonals AC and BD, we can conclude that angle ABC is 90°, because all the interior angles of a rectangle are 90°. I hope it's the correct explanation!
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