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Sagot :

Bonjour,

on sait que a + b = 180° donc si a = 3b on a 3b + b = 180° soit 4b = 180° d'où b = 180/4 = 45°

Bonsoir,

a = 3 b

a+b+b+b=180
180 /4 =45

b= 45°

a = 3* 45 => 135°

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