Question

determine aproximadamente o raio da circunferéciaque tem 12,56 cm de comprimentro

Answer 1

$r=?\\\\ C=12,56cm\\\\ \pi =3,14\\\\\\ C=2 \pi r \to 12,56=2*3,14*r\to 12,56=6,28r\to \frac{12,56}{6,28} =r\to \\ r=2cm$