Respuesta :

ghanami

Answer:

Step-by-step explanation:

the area is :  A =πr²  r : radius    d : diameter    d= 2r  so : r=d/2 = 4/2 = 2

A =3.14(2²) = 12.56

the circumference is P= 2πr 2(3.14)(2)=12.56