Answer: see below
Step-by-step explanation:
1, This one is easy. - A, B, C, and D
2. A line can be named by any two different points on the line, in either order.
↔DE, and ↔ED are both the same line.
The second line would be ↔BC or ↔CB.
3. The planes in the diagram are the flat sheets with capital letters in the corner. The vertical one (up and down) is plane S. The horizontal one (side-to-side) is plane T. Between the two, it looks like plane S contains points A, B, and C.
4. By similar reasoning as we used in #3 above, it looks like plane T is the one containing points A, D, and E.
** You may notice that point A lies in both planes, right along the line where the two planes intersect.
I hope this helps.
