On interior angles on the same side of transversal (co-interior angles)
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100+a=180(co interior angle)
a=80
a=80
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100+a=180 a +180-100=80. 2a+3a=180. 5a=180. a=180/5=36. 2a=2*36=72. 3a=3*36=108. a=180-60=120. b=180-110=70
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