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Sagot :

Bonsoir,

D'après le théorème de Thalès, on a

[tex]\frac{2}{x} =\frac{x}{8} \\\\\frac{2}{x} *x=\frac{x}{8}*x\\\\2 = \frac{x^{2} }{8} \\\\2*8=\frac{x^{2} }{8}*8 \\\\16 = x^{2} \\\\x = \sqrt{16}=4[/tex]

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