import java.util.Scanner;
class Exercicio3 {
public static void main
(String[] args
) { System.
out.
println("Escreva o valor do raio"); Scanner scan
= new Scanner
(System.
in);
double raio = scan.nextFloat();
double area
= Math.
PI * raio
* raio
;
System.
out.
println("O valor da area é " + area
); }
}
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