Question

3)calcule o comprimento de uma circunferência cujo o diâmetro mede:
(Π= 3,14)

a) 12cm
b) 5cm
c) 10cm

Answer 1

a)
D = 2.r
12 = 2r
2r = 12
r =12/2
r = 6 cm

C = 2.π.r
C = 2 . 3,14 . 6
C = 12 . 3,14
C = 37,68 cm

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b)
d = 5 cm

D = 2.r
5 = 2r
2r = 5
r = 5/2
r = 2,5 cm

C = 2.π.r
c = 2 . 3,14 . 2,5
c = 5 . 3,14
c = 15,7 cm
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c)
d = 10 cm

D = 2r
10 = 2r
2r = 10
r = 10/2
r = 5 cm

c = 2π.r
c = 2 . 3,14 . 5
c = 10 . 3,14
c = 31,4 cm

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