If you are facing east and you turn clockwise 90 degrees, you would be facing south. This is because a full circle is 360 degrees, so turning 90 degrees from east would bring you to the next cardinal direction, which is south.
South
North East
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Unfortunately there is no consistent direction: it depends on the context. If dealing with bearings (eg navigation) North is 000 degrees and the angle is measured in the clockwise direction starting from the Northward direction. In the context of coordinate geometry, particularly if working with polar coordinates, angles are measured in the anti-clockwise direction, starting with the x-axis (pointing East) as 0 degrees. Generally speaking, though, angles may be measured in any direction.
South East
If you are facing east and you turn clockwise 90 degrees, you will face south. The clockwise turn shifts your direction to the right, moving from east to south.
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South
North East
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East-facing azimuth = 90°Northwest-facing azimuth = 315°To turn from east-facing to northwest facing, you turn 225° to the right (clockwise).
north
As long as you are not standing on either the North or South Poles, the east would be to your right.
On a magnetic compass, 90 degrees corresponds to the east cardinal direction. This means that if you are facing 90 degrees, you are facing directly towards the east.
West
Southeast
If you are facing east and turn 180 degrees, you will be facing west. This means you will have turned around to face the opposite direction from where you initially started.