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Sagot :

D’après mes calculs:

A.
P = L x l
= 3 x 6
= 18cm

B.
P = 2 x π x r
= 2 x 3 x 30/2
= 2 x 3 x 15
= 6 x 15
= 90

C.
P= 2 x π x r / 4
= 2 x 3 x 2 / 4
= 6 x 2 / 4
= 12 / 4
= 3

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