Question

HELP! I GIVE MEDALS:)
rotate TRiangle ABC counterclockwise 270deg.
A(2 -1) B(-2 1) C(1 3)

Answer 1

@touseii45 do u think u could help me??

Answer 2

is there a picture?

Answer 3

I can draw one give me a sec

Answer 4

which point is it turning on?

Answer 5

it doesn't say it just said find the matrix that results from a 120deg counterclockwise totation from triangle ABC

Answer 6

okay uhm hold on(:

Answer 7

kkk ill be here

Answer 8

okay well first, do you know the definition of a what a matrix in this question is?

Answer 9

no

Answer 10

aha well your supposed to know that. i dont remember it

Answer 11

ooh that part doesn't matter in the question lol i found what it means

Answer 12

so do you know how to find the answer?

Answer 13

ya i no who do find that i just need the coordinate of triangle ABC rotated 270deg counterclockwise

Answer 14

maybe @Mertsj can help you lol

Answer 15

or @jim_thompson5910

Answer 16

@HawkCrimson can u help me out plezz :)

Answer 17

@electrokid could u help me

Answer 18

yup i got that

Answer 19

oh you got it?

Answer 20

what sems to be the problem?

Answer 21

i got -1 as well

Answer 22

no problem just cheeking my work with urs

Answer 23

ok, so what was your rotation matrix?

Answer 24

wait i think i got confused

Answer 25

\[
A'=\left[\begin{matrix}0&1\\-1&0\end{matrix}\right]\left[\begin{matrix}2\\-1\end{matrix}\right]=\left[\begin{matrix}-1\\-2\end{matrix}\right]
\]

Answer 26

similarly for the other points

Answer 27

ok

Answer 28

is that what you got for A'?

Answer 29

yup

Answer 30

good

Answer 31

so then is B 1 2

Answer 32

yup

Answer 33

and C 3 -1

Answer 34

bingo

Answer 35

how about them medals now?

Answer 36

sorry my sister had to use the computer for a sec thatnks for the help