3 is how many lines of symmetry a triangle has.
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A triangle, in general has none. An isosceles triangle has 1 axis of symmetry while an equilateral triangle has 3 axes.
The angle of rotation for a regular polygon with 7 sides isImmersive Reader
This could be either an isosceles triangle or a right angled triangle.
An equilateral triangle has 3 lines of symmetry
That will depend on what type of triangle it is because an equilateral triangle has 3 lines of symmetry whereas an isosceles triangle has only 1 line of symmetry but a scalene triangle has no lines of symmetry.