3 is how many lines of symmetry a triangle has.
It depends. If it is a right isosceles triangle, it has one axis of symmetry (the line which would bisect the right angle). A right scalene triangle has no axis of symmetry.
there is one
A triangle, in general has none. An isosceles triangle has 1 axis of symmetry while an equilateral triangle has 3 axes.
A scalene triangle has no axis of symmetry.
The angle of rotation for a regular polygon with 7 sides isImmersive Reader
You are an isosceles triangle
an isosceles
Isosceles
An isosceles triangle
An equilateral triangle has 3 lines of symmetry
This could be either an isosceles triangle or a right angled triangle.