1) When we are dealing with a Rhombus is convenient to recall some properties:
0. Opposite angles are congruent
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1. Consecutive angles are supplementary
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2. Congruent sides
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3. Diagonals bisect angles
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4. Diagonals are perpendicular.
So, we can sketch out the following, to better grasp it:
2) So, based on the properties: Opposite angles are congruent, and the fact that Diagonals bisect angles then we can state the following answer: