1.

The area of the triangle with vertices at \[(a,b+c,)\text{ (}b,c+a)\] and \[(c,a+b)\] is

A. \[0\]
B. \[a+b+c\]
C. \[{{a}^{2}}+{{b}^{2}}+{{c}^{2}}\]
D. \[1\]
Answer» B. \[a+b+c\]


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