alleryCount the mirror lines of an equilateral triangle.
A2
B1
C3
D6
Answer & Solution
Correct answer: C. 3
1. An equilateral triangle is a regular polygon with 3 sides.
2. A regular polygon with n sides has n lines of symmetry.
3. So it has 3 lines, one through each corner and the middle of the opposite side.
_Source: Wikipedia, Regular polygon (CC BY-SA 4.0), General properties_
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