Question

help please

Answer 1

@3mar

Answer 2

@jigglypuff314

Answer 3

@triciaal

Answer 4

I am sorry for late. I was not here!

Answer 5

When I am thinking, I concluded that:
- If the triangle was rotated (-180 or +180, whatever) about any one of its three vertices (A or B or C), the image would touch the pre-image at only one point, no more.

-If the rotation point was F, the image would touch the pre-image at no any point.

- BUT if the rotation point was E or D, the image would touch the pre-image at more than one point.

Try it yourself!

I hope I helped you, @princeevee.
+Sorry again for being late!