To prevent contamination.
You should use a protractor.
A 45-degree angle is an acute angle
A 90 degree angle is a right angle
If the triangle has a 30 degree angle and a 60 degree angle then the 3rd angle must be a 90 degree angle because there are 180 degrees in a triangle and so therefore it is a right angle triangle.
An angle greater than 90 degree is an obtuse angle.
You should point it at a 40 degree angle.
90 degree angle
The arm is usually positioned at a 45 degree angle.
45 degree angle(:
The supplement of a 148-degree angle is a 32-degree angle.
The complement of a 55 degree angle is a 35 degree angle
A 12 degree angle is an acute angle.
A 90 degree angle is a right angle.
118 degree angle
A 22 degree angle is an acute angle
Im assuming you are asking at what angle should you inject using the IM method. Which is at a 90 degree angle.
The supplementary angle to a 145 degree angle will be a 35 degree angle because 145 + 35 = 180.