I can give you three: Hold it in front of you - don't let it brush your clothing (causes a "roar"). Point it at your chin, not your mouth. Don't hold it too close.
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In geometry, a line is somply a collection of points. However, when naming a line, a line is nemed using two of its points.
Only one.
Yes, by using the distance formula.
yes
That is the principle of a sextant.