The equation $5x^2+12x + 13 = 0$ and $ax^2+bx + c = 0$ have a common root, where $a,b,c$ are the sides of $\Delta ABC$,then find $\angle C$ ? .....$^o$

  • A

    $45$

  • B

    $60$

  • C

    $90$

  • D

    $30$

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