By the property of the diagonals of a rhombus, its diagonals divide the corners of the rhombus at the vertices in half.
Then the angle CAD = BAD / 2. BAD = 2 * CAD = 2 * 28 = 56.
By the property of a rhombus, the sum of its adjacent angles is 180.
Angle BAD + ABC = 180, then:
ABC = 180 – 56 = 124.
Answer: Angle ABC is equal to 124.
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