GENERALLY, THE INJECTION IS GIVEN AT 450 angle.......
but also depends upon the site of an administration.
Subcutaneous are given at 150-180 angle and,
intramuscular can be given at an angle of 450 or, 900.
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YOU can use a right angle by making it small to make it acute or you can make it big so it is obtuse
So basically , you have an right angle and another angle . You draw an right angle over the angle your looking at and if its smaller than the right angle then its an acute angle . If its bigger than the right angle then its a obtuse angle . GoodLuck!(;
A right angle is 90 degrees if an angle is wider than 90 it is obtuse if it is less than 90 it is an acute angle.
Use a ruler to make a right angle triangle of dimension 3,4,5 the angle adjacent to the side of 4 units length is 30 degrees.
Easiest is to use a protractor. Alternative: Draw a 90 degree angle. Bisect the external angle so that it is 45 degrees. Trisect that angle so that the angle adjacent to the 90 degree angle is 15 deg Then 90 + 15 degrees = 105 degrees. Both, bisection and trisection require the use of a compass (and ruler).