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Q:

In ΔABC, AB=c cm, AC= b cm and CB=a cm, If  ∠A=2 ∠B, then which of the following is true?

  • 1
    $$ {a^{2}=b^{2}-bc}$$
  • 2
    $$ {a^{2}=b^{2}-ac}$$
  • 3
    $$ {a^{2}=b^{2}+bc}$$
  • 4
    $$ {a^{2}=b^{2}+ac}$$
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Answer : 3. "$$ {a^{2}=b^{2}+bc}$$"

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