What other name can you give to the line of symmetry of

(a) an isosceles triangle?

(b)a circle?

(a) An isosceles triangle has only 1 line of symmetry.

Therefore, this line of symmetry is the median and also the altitude of this isosceles triangle.

(b) There are infinite lines of symmetry in a circle. Some of these are represented as follows.

It can be concluded that each line of symmetry is the diameter for this circle.