in triangle ABC find the triangle CDB
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cb is a bisecter on ab
therefore it's divide angle c in equal angle
so, in triangle abc
angle a +angle b+angle c= 180
50 +30 +angle c =180
angle c =100
now in triangle cdb
angle c +angle d +angle b =180
50 +30 + angle d =180
angle d =100
therefore it's divide angle c in equal angle
so, in triangle abc
angle a +angle b+angle c= 180
50 +30 +angle c =180
angle c =100
now in triangle cdb
angle c +angle d +angle b =180
50 +30 + angle d =180
angle d =100
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