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Sagot :

Bonjour,

exercice n°1

a)
P= 7*4 => 28 cm

A= 7*7 => 49 cm²

b)

P = 2* ( 7+8) =  2*15 = 30cm

A= 7*7 => 56cm²

c)

P= 12+5+13 => 30cm

A=  (5*12)/2  =>30cm²

exercice 2

a)

(5*4)/2 => 10 cm²

b)

(7*3) /2  => 10,5cm²

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