Posted by **priyanka** on Friday, May 11, 2012 at 11:16am.

in triangle abc ad is bisector of angle a and angle b is twice of angle c prove that angle bac is equal to 72

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**Steve**, Friday, May 11, 2012 at 12:03pm
Not enough information. What does ad have to do with anything?

Now, if bad = abd, then we have

x + 2x + 2x = 180, so x = 36

and bac = acb = 72

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