Geometry

Question Analysis:
This question tests basic properties of an equilateral triangle, focusing on symmetry and segment relationships.

Key Concept Explanation:
An equilateral triangle has three lines of symmetry, not just one.
The other listed properties are fundamental characteristics of equilateral triangles.

Step-by-Step Solution:
A) Correct – By definition, all sides are equal.
B) Correct – Each interior angle measures 60°.
C) Incorrect – An equilateral triangle has three lines of symmetry.
D) Correct – In equ...