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Sagot :

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bonjour

( AB)²= ( 5 - 3 )² + ( 2 + 1 ) ² = 2 ² + 3 ² = 4 + 9 = 13

( BC )² = ( 7 - 5 )² + ( - 1 - 2 )² = 2 ² + ( - 3 )² = 4 + 9 = 13

(AC)² = ( 7 - 3 )² + ( - 1 + 1 )² = 4 ² = 16

le triangle est isocèle

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