Question

Em cada caso determine : a)diametro 3,5cm b) raio 8,4cm

Answer 1

Resolvendo calcular o comprimento da circunferencia :

a) diametro = D = 3,5cm
r = D/2 => r = 3,5/2 => r = 1,75cm
pi = 3,14

Formula :
#######
C = 2 x pi x r

C = 2 x 3,14 x 1,75

C = 6,28 x 1,75

C = 10,99cm

b) raio = r = 8,40cm
pi = 3,14

Formula :
#######
C = 2 x pi x r

C = 2 x 3,14 x 8,40

C = 6,28 x 8,40

C = 52,752 cm

C = 52,75cm