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Algerie974
@Algerie974
April 2019
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Aidez moi a faire la question 5 svp
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1) OA = AC / 2 = 6
SO = 8
Pythagore : SO²+OA²=SA² donc 8² + 6² = 64 + 36 = 100 = SA² donc SA = √100 = 10
2) Aire ABCD = AB² = (6√2)² = 36 * 2 = 72
3) Volume pyramide à base carrée = (aire de la base * hauteur) / 3
donc volume pyramide SABCD = (72 * 8) / 3 = 576 / 3 = 192
5) Thalès : SA' / SA = 3/10
6) 192 * 3/10 = 57,6
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SO = 8
Pythagore : SO²+OA²=SA² donc 8² + 6² = 64 + 36 = 100 = SA² donc SA = √100 = 10
2) Aire ABCD = AB² = (6√2)² = 36 * 2 = 72
3) Volume pyramide à base carrée = (aire de la base * hauteur) / 3
donc volume pyramide SABCD = (72 * 8) / 3 = 576 / 3 = 192
5) Thalès : SA' / SA = 3/10
6) 192 * 3/10 = 57,6