Réponses

2013-03-08T15:30:24+01:00

1)  OA² = SA² - OS² = 49 - 25 = 24

    OA = 2V6

 

2) AB² = OA² + OB² = 24 + 24 = 48

     AB = 4V3

 

3) Volume = 1/3 * AB² * SO = 16 * 5 = 80 cm3