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.

Question

amistre64 · Answer

swap x for y and negate

cwrw238 · Answer

A(4,0),  B(0.9), C(-2,-5)

amistre64 · Answer

(0,-4) = (--4,0)

(9,0) = (0,-9)

(-5,2) = (-2,--5)

amistre64 · Answer

c might be off, -5,2 is down 5 and right 2;   2,-5

hero · Answer

amistre, is "swap x and y and negate" the general method?

cwrw238 · Answer

how can it be (0, -9) ??

amistre64 · Answer

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amistre64 · Answer

im thinking it is general in me head

anonymous · Answer

ok i understand that thank you!!

amistre64 · Answer

might need to be tweeked with quadrants tho :)

amistre64 · Answer

(9,0) would be (-0,9)

amistre64 · Answer

so yeah, it works for me :)  as long as i dont typo meself lol

anonymous · Answer

amistre when u get a sec jump on mine for me?

cwrw238 · Answer

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