ATAR Notes: Forum

VCE Stuff => VCE Mathematics => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Specialist Mathematics => Topic started by: Natters on October 25, 2011, 09:44:41 pm

Title: guh
Post by: Natters on October 25, 2011, 09:44:41 pm

these parallelogram questions
okay say you have
A=(0,0,0)
B=(1,2,0)
C=(1,2,2)
and you have to find D so that ABCD is a parallelogram;
all the guides and explanations i can find just say AB=CD or BC=AD
couldnt you then find three different parallelograms? am i missing something?
(0,0,2), (2,4,2) and some other one would all make parallelograms afaik

Title: Re: guh
Post by: Natters on October 25, 2011, 09:47:06 pm

http://hotmath.com/learning_activities/interactivities/3dplotter.swf
try chucking them on that and you might get me

Title: Re: guh
Post by: dc302 on November 01, 2011, 06:15:42 pm

(2,4,2) cannot be a point because it's specifically asking for the parallelogram ABCD. If you had (2,4,2) as your D, your parallelogram would become ABDC.

Title: Re: guh
Post by: Natters on November 07, 2011, 08:41:36 pm

sry i forgot about this thread
how did you get abdc?
i don't think i was taught the labelling convention properly for some reason now

Title: Re: guh
Post by: dc302 on November 07, 2011, 09:33:08 pm

It just means in order to get the parallelogram, you have to go from A to B, B to D, D to C, and then C to A. Therefore it is the ABDC parallelogram, which is not what you want.

Title: Re: guh
Post by: Natters on November 07, 2011, 09:44:12 pm

ahh i think i get it, one more q
why are you answering my juvenile questions with your maths majors and whatnot
go do genius shit! :D