ready
A right angle turn is a 90 degree turn. Therefore, one ninth of a right angle turn would be a 10 degree turn.
90
flip vertical
Just go on the computer, RIGHT click on your mouse, go to GRAPHIC OPTIONS, then go to ROTATION, then click on the degree you would like and there you will fix it.
A U-turn. Turn 90 degree to your right or left, then make another 90 degree turn in the same direction as the first - voila! You're going back where you came from.
90 degrees
45 degree
the equivalent of 90 degree turn on a head bolt is a right angle, 1/4 a circle
A right angle is 90 degrees, so 45 degrees is half a right angle turn.
22.5
you'll have to turn right 90 degree
One half of a right angle is a 45 degree angle.