Succeeded in the challenge but have a question

As you can see I have managed the get the results the lesson wanted, however in the video he made x 90 degrees and I had to make Y a -90. I believe I understand why it is Y (due to using different face of the cube) but why is it - instead of +.

My apologies for any silly questions!

It just means that it’s on the opposite side of the Y axis. One side is negative and one side is positive and the side that you wanted it to turn to happens to be negative.

I used Y ( -90 ) as well.

Mine was -90 on the X-axis.
I think it’s the direction we decided to make the point of our wedge.

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