1.

In the shown figure, the value of a is equal to

A. \[y+z\]                                                 
B.  \[x+y\]      
C.  \[x+y+z\]                                            
D. \[~\frac{x+y+z}{2}\]
E.  None of these
Answer» D. \[~\frac{x+y+z}{2}\]


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