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1. |
The lengths of the sides of a triangle is x, y mid z respectively. If \[{{\mathbf{x}}^{\mathbf{2}}}\mathbf{+}{{\mathbf{y}}^{\mathbf{2}}}\mathbf{+}{{\mathbf{z}}^{\mathbf{2}}}\mathbf{=xy+yz+xz,}\] then the triangle is: |
A. | Isosceles |
B. | Equilateral |
C. | Scalene |
D. | Right - angled |
Answer» C. Scalene | |