The angle m∠ABC is 70 degrees.
How to find angle in a rhombus?
The angle in a rhombus can be found as follows;
The opposite angle of a rhombus are congruent.
Therefore,
∠B = 140 degrees
Hence, the diagonal of a rhombus bisect an angle.
Therefore,
m∠ABC = 140 / 2
m∠ABC = 70 degrees.
learn more on rhombus here: https://brainly.com/question/11966028
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