Geometry

Question Analysis:
This question checks your understanding of the relationship between the angle between lines and the resulting rotation.

Key Concept Explanation:
The resulting rotation from two reflections over intersecting lines is 2θ, where θ is the angle between the lines.

Step-by-Step Solution:
Since the rotation is 180∘, we have 2θ = 180∘, which gives θ = 90∘.

Option Analysis:
Only C correctly represents the angle between the lines.

C...