Respostas

2013-12-05T23:03:33-02:00
A=3,14xD2/4
A=12,56
12,56=3,14xD2/4
50,24=3,14xD2
D2=50,24/3,14
D2=16
D=Raiz quadrada de 16
D=4
Raio=D/2
Raio=2cm