Réponse:
Ex6
1) 17^2= 289 cm^2
2)8^2=64cm^2
3)x^2 = 17^2-8^2 = 225cm^2 (pythagore)
4) x^2=225 donc x = racine carré (225) = 15cm
Ex7
1) 6^2 =36cm^2
2) 8^2 = 64 cm^2
3) x^2=8^2+6^2 =100cm^2 (pythagore)
4)x= racine carré (100) =10cm
