Question
In the figure, M is the mid-point of AB and N is the mid-point of CD and O is the mid-point of MN. Prove that
(i) 
(ii) 
Solution
We have
...(1)
and 
...(2)
Adding (1) and (2) we get,
Adding (3) and (4), we get,
Also, 
and 
Adding, 
