PQRS is a trapezium in which PQ || SR and E is the midpoint of PS. If EG || PQ meets QR at G, show that G is the midpoint of QR
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Construct a line to join diagonal QS
Diagonal QS intersect the line MN at point O
It is given that PQ∥SR and MN∥PQ
We can write it as
PQ∥MN∥SR
Consider △SPQ
We know that MO∥PQ and M is the midpoint to the side SP
O is the midpoint of the line QS
We know that MN∥SR
In △QRS we know that ON∥SR
O is the midpoint of the diagonal QS
Hence, based on the converse mid-point theorem we know that N is the midpoint of QR
therefore it is proved that N is the midpoint of QR
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