Question

So, uh, help please?


I got four of these questions that can be assumed from the diagram wrong;
20. Line ED is perpendicular to Line CD--Yes
21. Line EF and Line CH intersect at point D--No
22. Points A,B, and C are collinear--No
23. Points F,E, and G are coplanar--No
24. Plane GAB intersects plane M in Line AB--Yes
25. Line AB is perpendicular to plane N--No

Diagram's in the comments. I've gone over is several times and I don't see what I got wrong :/

Answer 1

Sorry! Line EF *face palm*

Answer 2

Lines EF and CH do intersect at point D. Lines may be extended as far as you please (Euclid's second postulate).

Answer 3

For #25, why did you say no?

Answer 4

Because from the diagram it appeared that AB is perpendicular to plane N. At least to me...

Answer 5

"...from the diagram it appeared that AB is perpendicular to plane N...."

"25. Line AB is perpendicular to plane N--No"

So, why did you say no?

Answer 6

And for "20. Line ED is perpendicular to Line CD--Yes"
Why did you say yes?

Answer 7

Because I'm blonde and had a momentary brain lapse gah!

Answer 8

These brains are tricky things; gotta be careful with them.