If ab+bc+ca=0,What is the value of a^2+b^2+c^2?	Pick
A) (a^2+b^2+c^2)/2  B) (a+b+c)^2  C) (a^2+b^2+c^2)^2  D) a+b+c  E) c+a+b
The option B is correct.   The formula (a+b+c)^2=a^2+b^2+c^2+2(ab+bc+ca).   (a+b+c)^2=a^2+b^2+c^2+2(0).   a^2+b^2+c^2=(a+b+c)^2 is the answer
<result>B</result>
If ab+bc+ca=0,What is the value of a^2+b^2+c^2?