Given: 

Find: 

To find:
Given:
Theorem used:
If a line is parallel to one side of a triangle and intersects other two sides, then it divides these sides proportionally.
Calculation:
Given:
Since if a line is parallel to one side of a triangle and intersects other two sides, then it divides these sides proportionally.
Also given that
Thus
Now let us find the value of a.
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