enzo291205 enzo291205

19-04-2021
Mathematics

contestada

ABC est un triangle rectangle en B.
On donne : AB = 7:BC = a et AC = a +5.
Calcule a

Respuesta :

ghanami ghanami

19-04-2021

Answer:

Step-by-step explanation:

salut :

en utilisant le theorem de Pythagore on obtient :

AC²= AB² + BC²

(a+5)² = 7²+a²

a²+10a+25 = 49+a²

10a+25 =49

10a =24

donc : a = 24/10 = 12/5 = 2.4 unit

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