Question

WILL GIVE MEDAL AND FAN!!! Which are acceptable names for the plane?
Choose all answers that are correct.
http://static.k12.com/calms_media/media/1561000_1561500/1561206/1/d466dac6e71c2b806669825d137bdf9530657b88/MS_IMC-1401104-109017.jpg
A. Plane AU

B. Plane JAU

C. Plane R

D. Plane ABC

Answer 1

a plane has infinite length, infinite width and zero height...
everything except of R is a point on the plane... which makes R the plane... also the way it's written/labelled

good explanation here:
http://www.cliffsnotes.com/math/geometry/fundamental-ideas/points-lines-and-planes

orvideo here:
http://www.virtualnerd.com/tutorials/?id=PreAlg_09_02_0007

Answer 2

i guess as any 3 points automatically designate a single plane of existance, you can choose plane R or also any group of 3 points on this plane also (ie ABU, etc)

Answer 3

C. You can't use the point on the line to identify the plane.

Answer 4

.. ok true... but why not b also?

Answer 5

@Musics_life

Answer 6

Point A is on the line.

Answer 7

... and J and U are not...

Answer 8

You are correct although J and U are not on the line you can not identify the plane with ANY point that is on the line. To identify the plane with J and U it would have to be just Plane JU.

Answer 9

... no, sorry, u lost me again...
A b and c are excluded as they are collinear points, so there's an infinite number of planes in which these points exist in the z axis... however A,U and J are non-colinnear points... i just dont understand why any group of letters containing A B or C is now precluded...

Answer 10

sorry to be slow :(

Answer 11

:) It's alright. I'm just not the best explainer in the world. Lol. You can't use the points A, B or C because you can not identify a plane with points that are on the line. Am I correct?

Answer 12

i honestly don't know, sorry, thats where im stuck?
u cant use the points A,B and C together to describe the plane... I know that

Answer 13

@ganeshie8 gotta sec to explain something man, I'm feeling kinda dull tonight, sorry

Answer 14

need any 3 non collinear points to define a plane

Answer 15

I see @Musics_life said the same thing in past replies..

Answer 16

so answers B and C are correct, but D isn't (collinear) and A isn't (only 2 points cant describe a single plane)?

Answer 17

B can't be correct because it has a point on a line.

Answer 18

that looks good to me!

Answer 19

thats where im lost...? @Musics_life

Answer 20

@ganeshie8 Exactly I guess I could have said it that way. Lol.

Answer 21

well i have to agree correct answers are :-
B- (defining a unique plane with a line and a point not on it )
C- its the name of the plane already

why A and D are wrong :-
# for A i constructed a new red plane that also have AU thus AU is not unique
http://prntscr.com/5xvtzg

# for D
same idea
http://prntscr.com/5xvuy1