Plane: extends infinitely in all directions, 2-D.
Four ways to determine a plane:
three non-collinear points,
line and non-collinear point,
2 intersecting lines,
or
two parallel lines.
Point of intersection of a line and a plane is called foot of line.
- for line to be perpendicular to plane, line must be perpendicular to every line in the plane that goes through the foot.
If line intersects plane not containing it, then intersection is exactly one point. If two planes intersect, their intersection is exactly one line.
GIVEN: m||n
S intersects m and n
conclusion: line AB|| line CD
Sorry again for the borginess :/ i was really mad it all got deleted and wouldnt upload, ugh :(
To make up: heres a picture of me on Bo in Florida :D
-Maggie
oooh too bad. You should try hitting it. They usually dont hit back... they just shut down. Not that i would know. It's short lived BUT its a victory... over a computer. maybe you shouldn't hit it.
ReplyDelete