Geometry

Question Analysis:
This question focuses on understanding the properties of a reflection across the y - axis and identifying correct statements about the transformation from the black triangle to the red triangle.

Key Concept Explanation:
- Reflection across the y - axis: When a point is reflected across the y - axis, it transforms to .
For a geometric figure, all its points follow this rule.
The line of reflection (y - axis here) acts as a mirror, and corresponding points on the original and reflected figures are symmetric about this line.

Step - by - Step Solution:
- For a reflection across the y - axis, by the definition of reflection, corresponding points of the original (red triangle) and reflected (gray triangle) figures are equidistant from the y - axis. So, option A is correct.
- According to the rule