anonymous
  • anonymous
( I don't understand at all) ΔABC is translated 2 units down and 1 unit left. Then it is rotated 90° clockwise about the origin to create ΔA′B′C′. What are the coordinates of the vertices of ΔA′B′C′ ? A. A′(-2, 0), B′(1, -1), C′(-1, -1) B. A′(2, 1), B′(5, 0), C′(3, 0) C. A′(-1, -2), B′(2, -3), C′(0, -3) D. A′(-2, 1), B′(1, 0), C′(-1, 0)
Geometry
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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jim_thompson5910
  • jim_thompson5910
`ΔABC is translated 2 units down and 1 unit left` what you do is focus on each point one at a time. Start with point A. Move the point 2 units down and 1 unit to the left. You can do this with the coordinates `2 units down` means you subtract 2 from the y coordinate `1 unit left` means you subtract 1 from the x coordinate
anonymous
  • anonymous
https://scontent-iad3-1.xx.fbcdn.net/hphotos-xpt1/v/t1.0-9/12122805_10200907485207020_4619755177543600582_n.jpg?oh=d81039331b41de80dc4779aa0fc48975&oe=568550B4
jim_thompson5910
  • jim_thompson5910
what are the coordinates of point A?

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More answers

anonymous
  • anonymous
(0,0)
jim_thompson5910
  • jim_thompson5910
what does A shift to when you shift `2 units down and 1 unit left`
anonymous
  • anonymous
-2,-1
jim_thompson5910
  • jim_thompson5910
you mixed up x and y
jim_thompson5910
  • jim_thompson5910
|dw:1444170735186:dw|
anonymous
  • anonymous
i was just about to say that haha my bad -1,-2
jim_thompson5910
  • jim_thompson5910
|dw:1444170750332:dw|
jim_thompson5910
  • jim_thompson5910
don't forget the parenthesis to surround the 2 values
jim_thompson5910
  • jim_thompson5910
Then you'll do a 90 degree clockwise rotation about the origin To do that, you follow this rule: (x,y) ----> (y,-x)
anonymous
  • anonymous
okay
jim_thompson5910
  • jim_thompson5910
apply the rule to (-1,-2) to get (???, ???)
anonymous
  • anonymous
(-2,-1)
jim_thompson5910
  • jim_thompson5910
close, but notice how there is a negative in the second part of the rule `(x,y) ----> (y,-x)`
jim_thompson5910
  • jim_thompson5910
so it should be (-2,1) |dw:1444171012616:dw|
jim_thompson5910
  • jim_thompson5910
|dw:1444171040427:dw|
jim_thompson5910
  • jim_thompson5910
|dw:1444171057927:dw|
jim_thompson5910
  • jim_thompson5910
so after the shift and rotation, A moves from (0,0) to (-2,1)
jim_thompson5910
  • jim_thompson5910
apply these steps to B and C to figure out where they end up
anonymous
  • anonymous
is it D?
jim_thompson5910
  • jim_thompson5910
sorry my notification thing wasn't working
jim_thompson5910
  • jim_thompson5910
yes it's D
anonymous
  • anonymous
No problem, Thanks again c:
jim_thompson5910
  • jim_thompson5910
you're welcome

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