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Mignon80
@Mignon80
May 2019
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Bonjour pouvais vous m'aider s'il vous plaît ?
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fransey
MB= AB - AM et AM=AD
donc MB= a - b
p (ABCD) = 2AB + 2BC = 2a + 2b
A (ABEF)= a²
A ( AMND) = b²
aire surface hachurée
aire (ABEF) - aire (AMND) = a² - b²
périmètre: MB + BE + EF + FD + DN + NM
= a-b+a+a+a-b+b+b = 4a
si a = 7 et b = 5
MB = a-b = 7-5 = 2
p(ABCD) = 2a + 2b = 14 + 10 = 24
A(ABEF) = a² = 7² = 49
A (AMND) = b² = 5² = 25
aire surface hachurée = a² - b² = 49 - 25 = 24
périmètre: 4a = 7 x 4 = 28
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Lista de comentários
donc MB= a - b
p (ABCD) = 2AB + 2BC = 2a + 2b
A (ABEF)= a²
A ( AMND) = b²
aire surface hachurée
aire (ABEF) - aire (AMND) = a² - b²
périmètre: MB + BE + EF + FD + DN + NM
= a-b+a+a+a-b+b+b = 4a
si a = 7 et b = 5
MB = a-b = 7-5 = 2
p(ABCD) = 2a + 2b = 14 + 10 = 24
A(ABEF) = a² = 7² = 49
A (AMND) = b² = 5² = 25
aire surface hachurée = a² - b² = 49 - 25 = 24
périmètre: 4a = 7 x 4 = 28