Question

HELP PLEASE! How can i rotate this 90 degrees clockwise?

Answer 1

@jdoe0001 @SolomonZelman @ganeshie8

Answer 2

Relationships don't change. Move the three vertices separately.

(1,1) ==> (1,-1)
(2,-3) ==> (-3,-2)
(-4,-1) ==> (-1,4)

Pattern Recognition: Swap the numbers and change the sign on the new y-value.

Answer 3

Oh my god thank you so much. @tkhunny

Answer 4

There is a MUCH cleaner matrix version. Be ready for it when you trip over it.