Length of the sides of a triangle are a, b, c respectively. If $a^{2}+b^{2}+c^{2}$ = ab +bc + ca then the triangle is

Length of the sides of a triangle are a, b, c respectively. If $a^{2}+b^{2}+c^{2}$ = ab +bc + ca then the triangle is
1). isosceles
2). equilateral
3). scalene
4). right-angled

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