For this problem, we are given certain images that are divided by lines. We need to identify whether the line is a line of symmetry or not.
A line of symmetry is one that divides a shape into two equal parts.
The first one is a triangle, it is not a line of symmetry, since it does not divide the triangle in two equal parts.
The second one is not a line of symmetry either, since the two parts are different.
The last one is a line of symmetry since it divides the shape into two equal parts.
The answers are:
1. No
2. No
3. Yes.