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This question says use the coordinate rules to rotate triangle ABC 90 degrees...

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tjjavid | Student, Undergraduate | (Level 1) Honors

Posted May 12, 2013 at 12:07 PM via web

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This question says use the coordinate rules to rotate triangle ABC 90 degrees counterclockwise around the origin. List the coordinates and draw the image of triangle A' B' C'. In this case wouldn't (a, b) translate into (-b,a) since it says rotate ABC 90 degrees. I tried to draw the image based on the new coordinates but it looks nothing like triangle ABC.

http://static.panoramio.com/photos/medium/90173008.jpg

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pramodpandey | College Teacher | (Level 3) Valedictorian

Posted May 12, 2013 at 1:03 PM (Answer #1)

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We have given coordinates of triangle as,

A(1,2) ,B(3,-1) and C(-2,-2).

Thus

A'(-2,1),B'(1,3) and C'(2,-2)

equation of line A'B' is

y=(2/3)x+7/3

equation of line B'C'

y=-5x+8 and A"C" is

y=-(3/4)x-2/4

you are write ,translation of axis is not correct.

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t4trendesetter | (Level 1) Honors

Posted May 12, 2013 at 2:11 PM (Answer #2)

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We have given coordinates of triangle as,

A(1,2) ,B(3,-1) and C(-2,-2).

Thus

A'(-2,1),B'(1,3) and C'(2,-2)

equation of line A'B' is

y=(2/3)x+7/3

equation of line B'C'

y=-5x+8 and A"C" is

y=-(3/4)x-2/4

you are write ,translation of axis is not correct.

So how do I solve the problem? In the picture link A(-1,-2) B(1,2) C(3,-1). I'm supposed to rotate triangle ABC 90 degrees counterclockwise. I tried doing that but it did not look like triangle ABC. I don't think you understood my question.

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