bonsoir
AB² = 3² - 1 ² = 9 - 1 = 8
AB = √8 = 2 √2
CB² = ( √3)² - 1 ² = 3 - 1 = 2
CB = √2
aire = √2 ( 2 √2) = 4 cm²
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bonsoir
AB² = 3² - 1 ² = 9 - 1 = 8
AB = √8 = 2 √2
CB² = ( √3)² - 1 ² = 3 - 1 = 2
CB = √2
aire = √2 ( 2 √2) = 4 cm²