Quant geometry quiz query


In image 1 the question says diagonals AC and BD intersect at point O and that O is the midpoint of AC. However, in image 2 the solution video it says “point O midpoint of both diagonals”. Is this a question error or is it implied that if two diagonals are intersecting and one has the same midpoint as the intersection then it is same for the other diagonal? Because, just because of the line “O is midpoint of AC” I did not complete the question

Yes. You can attempt to prove this via triangle congruency.

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thank you