यदि एक त्रिभुज $ABC$ के कोण $A.P.$ में हैं,तो

  • A
    $c^2 = a^2 + b^2 - ab$
  • B
    $b^2 = a^2 + c^2 - ac$
  • C
    $a^2 = b^2 + c^2 - ac$
  • D
    $b^2 = a^2 + c^2$

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