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Question

If a triangle has 3 lines of symmetry, then it is
  1. Isosceles
  2. Right-angles
  3. Obtuse angled
  4. Equilateral

A
Obtuse angled
B
Isosceles
C
Right-angles
D
Equilateral
Solution
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In an equilateral triangle, the three angle bisectors of the three angles are the lines of symmetry.

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