ABCDE is a regular pentagon . find angles of triangle ADC

Answer 1

each angle of the pentagon = 180 - 360/5 = 180 -72 = 108
so angle B = 108
180 - 108 = 72 and 72/2 = 36 = BAC = BCA
so angle ACD = ADC = 108-36 = 72 and angle DAC = 180 - 2(72) = 36
72 36 72