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Equilateral Triangle means all sides of the triangle are equal, hence all 3 angles of the triangle are equal.

Hence, angle ABC = angle BAC= angle ACB=180÷3=60

angle BCD=180-43-60=77

Hence, angle ABC = angle BAC= angle ACB=180÷3=60

angle BCD=180-43-60=77

Thank uou but you were a little late