'Isocoles' and 'Equalateral' triangles are, scalene, right angled, and obtuse triangles are not.
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It can be but it doesn't have to be. Some triangles are symmetrical and others aren't.
No such thing as a regular triangle. You need to be more accurate in your triangular description. Equilateral triangle is symmetric about three lines of symmetry. Isosceles triangle is symmetric one line of symmetry. Right-angled, and Scalene triangles have no lines of symmetry.
Yes it has 3
Because if you rotate it about its center it looks different (not symmetric) no matter what the angle is.