8. A rhombus is a 4-sided polygon that has four congruent sides. Prove that opposite sides of a rhombus must be parallel. NOTE #1: I strongly recommend you draw yourself a rhombus and label the vertices before you begin. NOTE #2: While this proof never specifically references triangles, proving two triangles are congruent is a critical step to correctly proving that the opposite sides of a rhombus are parallel. NOTE #3: You can stop once you have proven that one set of opposite sides are parallel. Proving the second set is not difficult from that point, but is the same as proving the first set and no need to do extra work just because.

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Q: What additional information is needed to prove the triangles are congruent by the SAS Postulate?

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A:

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A:

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A:

Q: 2. Find the sum of the interior angle measures of a convex 11-gon.

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A: