Solving 
we get 
Step-by-step explanation:
We need to find the value of a. We are given:
Solving:
So, Solving we get
Keywords: Solving Expressions
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The answer is 12. Hope this helps!
Answer:
congruent triangles
Step-by-step explanation:
You can eliminate useless answers based on their wording. "Similar" anything cannot be used to prove congruence. "Rectangles" will not help you prove congruence of parallelogram sides. The only reasonable choice is ...
congruent triangles
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Typically, a diagonal is drawn through the figure, and the two triangles created are shown to be congruent, often by ASA. Then, by CPCTC, sides of the parallelogram are shown to be congruent.
