Ans : a
ABC is an equilateral triangle.
thus angle ABC=60 degree.
Traingle DBC is isosceles triangle .
Thus Angle DBC=47degree as DCB = 47.
Thus angle ABD = 60-47= 13 degree
ABC is an equilateral triangle.
thus angle ABC=60 degree.
Traingle DBC is isosceles triangle .
Thus Angle DBC=47degree as DCB = 47.
Thus angle ABD = 60-47= 13 degree
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