In an equilateral triangle: 3
In an isosceles triangle: 1
In a scalene triangle: 0
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A regular triangle (aka equilateral triangle) has three lines of symmetry - these are its medians, In general, a regular n-gon has n lines of symmetry.
An isosceles triangle has 1 line of symmetry, an equilateral triangle has 3 and a scalene triangle has no lines of symmetry.
How many lines of symmetry does an equilateral triangle have?
3
it depends upon the triangle that it have equal sides or not