If a, b and c are the sides of a triangle, and a^2+b^2+c^2 = bc+ca+ab, then the triangle is
a.equilateral b.isosceles c.right-angled d.obtuse-angled

• a.equilateral
  
  eg if we take 6 as a side of triange a=6,b=6,c=6
  then lhs=6^2+6^2+6^2=108
  and rhs=6*6+6*6+6*6=108
  lhs=rhs
• 12 years agoHelpfull: Yes(3) No(0)
• a.equilateral
  
  say each side is x units.
  then
  
  a^2+b^2+c^2 = 3x^2
  bc+ca+ab = 3x^2
  hence
  a^2+b^2+c^2 = bc+ca+ab
  
  
• 12 years agoHelpfull: Yes(3) No(0)