Can someone please help me with a matrice question?

- anonymous

Can someone please help me with a matrice question?

- katieb

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- anonymous

##### 1 Attachment

- anonymous

I got the answer as to what the vertices of th etriangle wld be but like does the transformation represent?

- anonymous

Please don't use doc. just copy and paste question and chooses

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## More answers

- anonymous

lol whtvr I used a pdf and most ppl dont have an issue with that

- anonymous

It is coming from a pdf format so I have to print screen it

- anonymous

Can u help me?

- anonymous

huh

- anonymous

ok i will try :/

- anonymous

LOL ppl can help

- anonymous

k

- anonymous

im "traying to try"

- anonymous

lol

- phi

Do you know how to do the matrix multiplication?

- anonymous

rows by columns?

- anonymous

yes

- anonymous

I did that

- anonymous

I got the answer of the points of the triangle but i need to know abt the transformation

- anonymous

you need to represent the transformation as a triangle?

- anonymous

how it see pictorially?

- anonymous

ummm ok they gave you the points of the traingle and then it asks u to transform by multiplying it by matrix A

- anonymous

I was able to get the points of the two transformed triangles but i dont get what the transformation is

- anonymous

tl;dr
\[\Large \begin{array}{l}
A = \left[ {\begin{array}{*{20}{c}}
0&{ - 1}\\
1&0
\end{array}} \right]\\
T = \left[ {\begin{array}{*{20}{c}}
{\begin{array}{*{20}{c}}
1&2&3
\end{array}}\\
{\begin{array}{*{20}{c}}
1&4&2
\end{array}}
\end{array}} \right]\\
AT = \left[ {\begin{array}{*{20}{c}}
{\begin{array}{*{20}{c}}
{ - 1}&{ - 4}&{ - 2}
\end{array}}\\
{\begin{array}{*{20}{c}}
1&2&3
\end{array}}
\end{array}} \right]\\
AAT = \left[ {\begin{array}{*{20}{c}}
{\begin{array}{*{20}{c}}
{ - 1}&{ - 2}&{ - 3}
\end{array}}\\
{\begin{array}{*{20}{c}}
{ - 1}&{ - 4}&{ - 2}
\end{array}}
\end{array}} \right]
\end{array}\]

- anonymous

Thanks FSM:D

- anonymous

but like how wld i explain the transformation?

- anonymous

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- anonymous

i dont know, may be you could construct some ideas from that.. sorry

- anonymous

i think in the a) AT; the triange rotates

- anonymous

Thnaks :D

- anonymous

I drew all the triangles on a graph

- anonymous

and in AAT; it rotates again?

- anonymous

So it easier to see what happennned

- anonymous

AAT it gets flipped in the y an dthen x axis

- anonymous

It gets mirrored in the y=-x axis

- anonymous

but AT is confusing

- anonymous

It get mirrored in the y axis

- anonymous

but then there seems to be another transformation

- anonymous

i think it also he inverse

- anonymous

I am not sure and doesnt seem like any1 else is either

- anonymous

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- anonymous

Thanks that was helpful :D

- anonymous

thanks it was a really good question

- phi

A is rotating the triangle 90º counter clockwise around the origin. Notice that 2 of the rotations gives you 180º

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