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Zale101
 one year ago
Vector problem: I’m trying to determine if the mentioned vertices are right triangle.
Zale101
 one year ago
Vector problem: I’m trying to determine if the mentioned vertices are right triangle.

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Zale101
 one year ago
Best ResponseYou've already chosen the best response.2A(4,53) B(3,2,1) C(7,0,2) AB=(34)i+(25)j+(1+3)k =i3j+2k=<1,3,2> BC=(73)i+(02)j+(2+1)k =4i2jk=<4,2,1> AC=(74)i+(05)j+(2+3)k =3i5j+k=<3,5,1> AB*BC=1*4+3*2+2*1=1 AB*AC=1*3+3*5+2*1=14 BC*AC=4*3+2*5+1*1=21 (pardon my missing vector arrows, and hats on i,j,k)

Zale101
 one year ago
Best ResponseYou've already chosen the best response.2Somehow, by using the dot product, i couldn't get zero in either AB*BC, AB*AC, and BC*A

Zale101
 one year ago
Best ResponseYou've already chosen the best response.2There's an error with my arithmetic i suppose.

dan815
 one year ago
Best ResponseYou've already chosen the best response.0have u learnt how to take the dot product

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0you did make an error when you did the dot product

dan815
 one year ago
Best ResponseYou've already chosen the best response.0either that or see the length are in the form a^2+b^2=c^2

Zale101
 one year ago
Best ResponseYou've already chosen the best response.2Oh okay. Thanks! This semester is like my first time learning the doc product, can't remember it from precal. I'll go over what i did. Thanks again @dan815 and @jim_thompson5910 .

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0you have the right steps, just a silly arithmetic mistake

Zale101
 one year ago
Best ResponseYou've already chosen the best response.2Lol Alright, i feel good now. I was afraid that i didn't know what i'm trying to solve for.

dan815
 one year ago
Best ResponseYou've already chosen the best response.0the dot product and the cow law are very closely related

Zale101
 one year ago
Best ResponseYou've already chosen the best response.2AC*BC=1*4+3*2+2*1=0

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0I think you mean AB*BC=1*4+3*2+2*1=0 right?

jim_thompson5910
 one year ago
Best ResponseYou've already chosen the best response.0that's ok. I'm getting the same result. So AB is orthogonal (ie perpendicular) to BC
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