They improve communications.
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They are used to reflect radio waves to improve long distance communications and they are used for GPS location systems
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.
We can use technology in everyday life by using it properly. You must think first what would be the effect of that technology to the people and the environment. Use it only if necessary and with appropriate purpose. And don't used technology that exploit and destroy our environment.
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