3 lines
* * * * *
None if it is acute angled scalene
One if it is acute angled isosceles
and
Three if it is equilateral.
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An acute scalene triangle has none. An acute isosceles triangle has one and an [acute] equilateral has three.
An equilateral triangle has 3 lines of symmetry
3 is how many lines of symmetry a triangle has.
It has 3 lines of symmetry
In general, a triangle can have 0, 1 or 3 lines of symmetry.