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Sagot :

EF=ED+1,3^2
ED^2=3,7^2-1,3^2
ED^2=13,68-1,69
Ed^2=11,99
ED=3,46

théorème de Pythagore.

[tex] {ef}^{2} = {ed}^{2} + {df}^{2} [/tex]

[tex] {ed}^{2} = {3.7}^{2} - {1.3}^{2} [/tex]

[tex] {ed}^{2} = 13.69 - 1.69[/tex]

=12

=

[tex] \sqrt{12} [/tex]

environ 3.5 cm

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