Q. 114.1( 15 Votes )

ABCD is a paralle

Answer :

We have the diagram as

Given: DP = PC &

CQ = (1/4)AC …(i)

To Prove: CR = RB

Proof: Join B to D

As diagonals of a parallelogram bisect each other at S.


Dividing equation (i) by (ii), we get

CQ = CS/2

Q is the midpoint of CS.

According to midpoint theorem in ∆CSD, we have


Similarly, in ∆CSB, we have


Also, given that CQ = QS

We can conclude that, by the converse of midpoint theorem, CR = RB.

That is, R is the midpoint of CB.

Hence, proved.

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