Respuesta :

Answer:

4[tex]\pi[/tex]

Step-by-step explanation:

A = [tex]\pi[/tex][tex]r^{2}[/tex]

A = 4[tex]\pi[/tex] [tex]cm^{2}[/tex]

4[tex]\pi[/tex] =

4 = [tex]r^{2}[/tex]

2 = r

C = 2[tex]\pi[/tex]r

C = 2(2)[tex]\pi[/tex]

C = 4[tex]\pi[/tex]