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Answer:
angle adc= 180-100 ( linear pair)
= 80°
dac+ 80°+70°=180° (asp)
dac= 30°
as angle b is twice angle dac
then b=60°
dab+100°+ 60°=180° (asp)
dab = 20°
{asp= angle sum property}
Step-by-step explanation:
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