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Question

State true or false:
In the given figure, the diagonals AC and BD intersect at point O. If OB=OD and ABDC, then ABCD is a parallelogram.
187412_9e978b15dbf24e06a4332839eba1b242.jpg

A
True
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B
False
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Solution

The correct option is A True
To: ABCD a parallelogram
Construction :Draw OXDC
In BCD
O is the mid point of BD and OXDC
Byconverseofmidpointtheorem
X is the mid point of BC and OX=12DC
OX=12AB
Now in ABC,
X is the mid point of BC and OX=12AB
Byconverseofmidpointtheorem
O is the mid point of AC and OXAB
As OXABandOXDC
=ABDC
Now ABDCandAB=DC
ABCDisaparallelogram

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