Geometry

Question Analysis:
This question combines CPCTC with solving for a variable.
The main focus is on using the equality of corresponding sides to find x.

Key Concept Explanation:
Since △XYZ ≅ △LMN, XY corresponds to LM and they are equal.

Step - by - Step Solution:
Set up the equation XY = LM.
Given XY = 3x and LM = 9, we have 3x = 9.
Divide both sides by 3, so x = 3.

Common Mistakes:
Setting up the equation wrong or ...