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AlekseyPX
3 years ago
10

Can someone please answer. There is one problem. There is a picture. Thank you!

Mathematics
1 answer:
jonny [76]3 years ago
5 0
SA=4pir^2
78.54km^2=SA
78.54=4pir^2
divide both sides by 4
19.635=pir^2
aprox pi=3.14 so divide both sides by 3.14
6.25318=r^2
sqrt both sides
2.50063=r
round
radius=2.5km

this question is flawed in that it gives the wrong units

answer is the option with 2.5 in it
2nd one
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