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Sagot :

Bonjour,

Exercice 32 :

Application du théorème de Pythagore :

[tex] {JK}^{2} = JL {}^{2} - IJ {}^{2} [/tex]

[tex]JK {}^{2} = 5 {}^{2} - 4{}^{2} [/tex]

[tex]JK {}^{2} = 25 - 16[/tex]

[tex]JK {}^{2} = 9[/tex]

[tex]JK = \sqrt{9} [/tex]

[tex]JK = 3[/tex]

La longueur [JK] vaut donc 3 cm

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