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Answer: x = 20. X = 20 Consecutive internal Angles Theorem: edge BCD + edge ADC = 180 ° Substitute edge ADC = 4
x = 20 Consecutive interior Angles Theorem: angle BCD + angle ADC = 180^circ instead of angle ADC = 4 x , angle BCD = 100^circ right into angle BCD + angle ADC = 180^circ: 100^circ + 4 x = 180^circ calculation 100^circ + 4 x = 180^circ: x = 20
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