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levacccp [35]
3 years ago
13

La figure ci-dessus représente une pyramide du sommet S.

Mathematics
2 answers:
elena-14-01-66 [18.8K]3 years ago
8 0
The answer is going to be option 3) - calculer le volume de la pyramid SEFGH
Aloiza [94]3 years ago
3 0

Answer:

Step-by-step explanation:

Voir le diagramme ci-attaché.

1) Distance EG

À l'aide du théoreme Pythagore, EG^2 = EF²+FG² = 4²+3² = 25

=>  EG = sqrt(25) = 5

2) Distance SO

Par la symétrie, EO=OG=(EG/2)=5/2 = 2.5

Encore, à l'aide du même théoreme,SE^2 = SO²+EO²

SO^2 = SE² - EO² = 6.5²-2.5² = 42.25 - 6.25 = 36

SO = sqrt(36) = 6  QED

3) Volume de la pyramide

V = (Aire de la base * hauteur ) /3

= (EF * FG) * SO /3

= (4*3) * 6 /3

= 24 cm³

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