Question

TRUE or FALSE? When Point E (-2, -5) is rotated 270° counterclockwise about the origin, it becomes (-5, 2).

Answer 1

@wio

Answer 2

@amistre64 please help me!

Answer 3

any way to check it that you know of?

Answer 4

well i guess i could do the actual problem? lol

Answer 5

lol, that would be one method yes. i know of several more

Answer 6

oh really? like what?

Answer 7

well, since 270 = -90, then the dotproduct of the 2 vectors would equal 0, and have the same length

Answer 8

another method is a rotation matrix

-2cos(270) +5sin(270) = 5
-2sin(270) -5cos(270) = -2

Answer 9

ok so its false?

Answer 10

did you work your method? or is that just a guess?

Answer 11

well i worked the method with the rotation matrix

Answer 12

-2,-5
-5, 2
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10-10 = 0 so they are 90 from each other.



im getting false as well this way