I have an exam tomorrow, and I am really confused about this...

here let's dive into the problem:

for example (im just gonna make something up lol)

we want to rotate the point (-2,3) 90 degrees counterclockwise...

we already know that if they tell us to rotate something 90 degrees, it means to rotate it in a counterclockwise direction

so then what would it mean to rotate something 90 degrees counterclockwise if normal 90 degrees is already counterclockwise....

if somebody can clarify this for me, i'd really appreciate it

thank you!!

Nirvana Oct 24, 2019

#1**+4 **

Wouldnt the points just return back to its original points, or am I mistaken?

SVS2652 Oct 24, 2019

#2**+1 **

For a rotation 90 degrees around the origin, switch the coordinates for example if it is: (x,y) it will be: (y,x) notice that y became x and x became y values.

In your example,

-2,3 will be 3,-2

Speaking of counterclockwise

Yes, if we rotate 90 degrees it is already in counterclockwise, It is just there to confuse you.

Guest Oct 24, 2019

#4**0 **

wait wait wait,,,

i agree with everything you just said except for one thing...

shouldn't 90 degree rotations do this to a point??

\((x,y)\rightarrow(-y,x)\)

but thank you for your help :) your answer was extremely clear to understand.

Nirvana
Oct 24, 2019

#7**+1 **

If someone told me to rotate something by 90 degrees I would not know that I was meant to go counter clockwise.

I would ask "which direction?"

I have never heard of that 'standard' assumption before.

Melody Oct 25, 2019