Ta có : BAH = 2CAH (gt)
Mà BAH + CAH = BAC = 64°
=> CAH + 2CAH= 64°
=> 3CAH = 64°
=> CAH = \(\frac{64}{3}\)
=> BAH = 64 - \(\frac{64}{3}\)=\(\frac{128}{3}\)
=> C = 180 - 90 - \(\frac{64}{3}\)=\(\frac{206}{3}\)
=> B = 180 - 90 - \(\frac{128}{3}\)= \(\frac{142}{3}\)