An equilateral triangle has how many lines of reflection symmetry?
AOne
BTwo
CThree
DSix
Answer & Solution
Correct answer: C. Three
1. Each line runs from a vertex to the midpoint of the opposite edge.
2. An equilateral triangle has three vertices, so three such lines.
3. Six is the number of symmetry motions in all (three flips and three turns), not the lines.
_Source: Wikipedia, Equilateral triangle, section Symmetry_
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