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The sides of a triangle are x^2+x+1, 2x+...

The sides of a triangle are `x^2+x+1, 2x+1 and x^2-1.` Prove that the greatest angle is `120^0`

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The correct Answer is:
`120^@`
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Knowledge Check

  • If the measures of the sides of triangle are (x^2 - 1), (x^2 + 1) and 2x cm, then the triangle would be

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  • If the equations of three sides of a triangle are x+y=1, 3x + 5y = 2 and x - y = 0 then the orthocentre of the triangle lies on the line/lines

    A
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    C
    `2x-3y=1`
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