What other name can you give to the line of symmetry of
(a) an isosceles triangle?
(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.