Where P is on the drawing is where O will end up. 270 degrees = 3/4 of one revolution ( 360 degrees)
One revolution is 360 degrees, divided by 4 = 90 degrees
90 degrees multiplied by 3 (3 being 3 of the 4 quarters of 90)
3 x 90 = 270 degrees
270 degrees is 3/4 of a full revolution
1/4 turn O is on left. 90 degrees
2/4 turn O is at top. 180 degrees
3/4 turn O is on the right. 270 degrees
4/4 turn O is back at the bottom. 360 degrees