SOLUTION: Let {{{a}}}, {{{b}}} and {{{c}}} be the sides of a triangle. If {{{a^2 + b^2 + c^2 = ab + bc + ca}}}, find the type of triangle it is.

Question 1105372: Let , and be the sides of a triangle. If , find the type of triangle it is.
Answer by ikleyn(52864) (Show Source): You can put this solution on YOUR website!
.

If   = ab + ac + bc,  then


 = 2*(ab + ac + bc),   or,  equivalently,


 = 0,


which implies  a = b,  a = c  and  b = c.


Hence, the triangle is  EQUILATERAL.

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