Angle B = ADC arc / 2
32 = ADC arc / 2
ADC arc = 2 × 32
ADC arc = 64
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ADC arc + ABC arc = 360
64 + ABC arc = 360
ABC arc = 360 - 60 - 4
ABC arc = 300 - 4
ABC arc = 296
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Angle D = ABC arc / 2
x = 296 / 2
x = 148
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Angle A = x - 40
Angle A = 148 - 40
Angle A = 108 degrees
