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In the figure, we have BX=1/2AB, BY=1/2BC . . .

Question : In the figure, we have BX=½AB, BY=½BC and AB=BC show that BX=BY. Also write the axiom used. 
Doubt by Purvi 

Solution : 
Given : 
BX=½AB
BY=½BC
AB=BC

To Prove : 
BX=BY

Proof : 
BX=½AB (Given)
2BX=AB
AB=2BX — (1) 

BY=½BC (Given)
2BY=BC
BC=2BY — (2)

AB=BC (Given)
2BX=2BY
BX=BY
[
Things which are double of the same things are equal to one another]

Hence Proved.