Because angle ABD= angle DAB= angle ACD, angle DAC= angle CDA,

ABD+BAD+ADB= 180 degrees.

Angle ADB= 180 degrees-Angle DAC = & gt2ABD=DAC

So Abd+ (bad +CAD)+ACD = 5abd = 180 degrees.

Available: angle ABD=36 degrees.

Therefore, the angle BAC= 108 degrees.