Question Analysis:
This question is centered around applying CPCTC to find the value of a variable.
The key is to use the fact that corresponding sides of congruent triangles are equal to set up an equation and solve for .
Key Concept Explanation:
For congruent triangles and , corresponding sides are congruent.
Here, in corresponds to in .
Step - by - Step Solution:
1. Since , by CPCTC,
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