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Sagot :

LROUMANE

Explications étape par étape

On a BC^2 = AB^2 + AC^2

( x + 3 )( x + 3 ) = 6^2 + x^2

x^2 + 6x + 9 = 36 + x^2

6x + 9 = 36

6x = 27

x = 27/6 = 4,5

On a donc AC = 4,5 cm

AB = 6 cm

BC = 4,5 + 3 = 7,5 cm

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