Question

calcule o comprimento da cirunferencia quando;
 
 1) o diametro mede 3 cm
2) o diametro mede 8,2 cm

Answer 1

1) r = d/2 
r = 3/2
r = 1,5 cm

C = 2. π. r
C = 2 . 3,14. 1,5
C = 9,42 cm

2) r = d/2
r = 8,2/2
r = 4,1

C = 2. π. r
C = 2. 3,14. 4,1
C = 25,748 cm