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Answer:
Repeaters.
Step-by-step explanation:
This is essential to effective communication because your EMS system must use Repeaters.
These are machines used to carry signals across a great distance. We may be in ambulances or put around an EMS network in different areas. The repeater receives and re transmits signals from lower power systems, such as mobile and handheld phones, to a higher power.
It's the sum of a geometric sequence.
Let's rewrite it a bit:

And now let's calculate this sum
:

Now let's calculate the initial sum:

Is there a Pic with this?
Answer:
If you have the radius:
You can use the Circumference which us equal to:

Then substitute:
