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A television station is reported to have a viewing and listening radius of 135 km. from its sending station. How many sq. km of territory does this station serve

Sagot :

I am not really sure about this but is this just an area question? 

The area is given by pi*r^2

So plugging that in, we get:
(pi)(135)^2=18225(pi)

The answer I got is 57255.53 sq. km.