They are used to reflect radio waves to improve long distance communications and they are used for GPS location systems
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They typically aren't useful in your everyday life unless your job requires them.
They improve communications.
Global Positioning Systems (GPS) use trigonometry. There are a number of satellites orbiting the earth. The GPS uses the time signals sent by these satellites to establish the distance to the satellites. Trigonometry is then used to find the location of the GPS unit.
44% to 39% percent of men carry pocket knives because they are a useful tool in everyday life.
Everyday life is frequently irrational.