anonymous
  • anonymous
Find the coordinates of the image of a triangle with vertices : A(0,-4), B(9,0), and C(-5,2) for a rotation of 90 degrees counterclockwise about the origin.
Mathematics
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SOLVED
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chestercat
  • chestercat
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amistre64
  • amistre64
swap x for y and negate
cwrw238
  • cwrw238
A(4,0), B(0.9), C(-2,-5)
amistre64
  • amistre64
(0,-4) = (--4,0) (9,0) = (0,-9) (-5,2) = (-2,--5)

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More answers

amistre64
  • amistre64
c might be off, -5,2 is down 5 and right 2; 2,-5
Hero
  • Hero
amistre, is "swap x and y and negate" the general method?
cwrw238
  • cwrw238
how can it be (0, -9) ??
amistre64
  • amistre64
|dw:1327872649211:dw|
amistre64
  • amistre64
im thinking it is general in me head
anonymous
  • anonymous
ok i understand that thank you!!
amistre64
  • amistre64
might need to be tweeked with quadrants tho :)
amistre64
  • amistre64
(9,0) would be (-0,9)
amistre64
  • amistre64
so yeah, it works for me :) as long as i dont typo meself lol
anonymous
  • anonymous
amistre when u get a sec jump on mine for me?
cwrw238
  • cwrw238
|dw:1327872730598:dw|
amistre64
  • amistre64
right, I negated the wrong one; in general id say: (x,y) flips tp (-y,x)
cwrw238
  • cwrw238
yep

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