30 degree lateral position referrs to the angle of a person's hips and/or shoulders in relation to the bed. Nursing practice historically focuses on pressure ulcer prevention by repositioning patients every two hours. Originally patients were positioned in a 90 degree lateral sidelying position. It was found this placed undue pressure on shoulder joints and the trochanter (hip joint). In a 30 degree lateral position the weight of the person resting upon the mattress is on the muscle pad of the upper buttock and is less likely to result in a pressure ulcer.
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There are no gloves alone that are rated for -30 degree use, but there are multiple pairs, that in addition to the use of a liner will be usable at -30 degrees.
It is: 7.5*sin(30) = 3.75 meters
30 degrees
A polygon having 30 degree exterior angles is a dodecagon having 12 sides.
cos 60