Question

1 ) calcule a medida do raio de uma circunferência de comprimento igual a 25,12 cm

Answer 1

d=2×r
2×r=d
r=d/2
r=25,12/2
r=12,56cm

Answer 2

$c = 2 * \pi * r\\\\25,12=2*3,14*r\\\\25,12=6,28*r\\\\6,28*r=25,12\\\\r=25,12/6,28\\\\r=4\\\\\\.:raio=4:. \\ \\ \\-~Espero~Ter~Ajudado~E~Bons~Estudos~!!$