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Sagot :

Bonjour,

La somme des angles d'un triangle = 180°

x+40 +40 + 3x-16 = 180

4x = 180 - 40 -40 +16

4x =116

x= 116/4 =29

A => 40°

B= 29+40 => 69°

C= (3*29 ) - 16 =>71°

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