Bonsoir,
1) b) Pythagore : SA²=OA²+OS²
donc : OS² = SA²-OA² = 13² - 5² = 169 - 25 = 144
donc : OS = √144 = 12 cm
2) volume = 1/3 × π × 5² × 12
= 100π cm³
≅ 314,2 cm³
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Bonsoir,
1) b) Pythagore : SA²=OA²+OS²
donc : OS² = SA²-OA² = 13² - 5² = 169 - 25 = 144
donc : OS = √144 = 12 cm
2) volume = 1/3 × π × 5² × 12
= 100π cm³
≅ 314,2 cm³