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Help please:) i’m trying to get all of this work completed but i just don’t understand it

Help please:) i’m trying to get all of this work completed but i just don’t understand-example-1
User Javirs
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10 votes
The answer is 50.24, have a nice day
User Johannchopin
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\pi r^(2) =\\3,14*4^(2) \\3,14*16\\=50.24

User Jacob Gorban
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