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Sagot :

Bonjour,

On utilise le théorème de Pythagore,

[tex] {cb}^{2} = {ab}^{2} - {ac}^{2} [/tex]

[tex] {cb}^{2} = {6}^{2} - {4}^{2} [/tex]

[tex] {cb}^{2} = 36 - 16[/tex]

[tex] {cb}^{2} = 20[/tex]

[tex]cb = \sqrt{20} [/tex]

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