It can have an axis (line) of symmetry, but need not.
It will look like a right angle triangle with a 90 degree angle and two 45 degree angles and will have one line of symmetry
The angle of rotation for a regular polygon with 7 sides isImmersive Reader
You will finish up with 2 triangles which are mirror images of each other, each with one angle being a right-angle. There is no axis if symmetry unless at least 2 of the 3 sides are equal.
This could be either an isosceles triangle or a right angled triangle.
3 is how many lines of symmetry a triangle has.
A scalene triangle has no axis of symmetry.
You are an isosceles triangle
An isosceles triangle
the distance from a point on either ray of the angle that is equidistance from the axis of symmetry is the line of symmetry. the line of symmetry dives the angle in half.