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Sagot :

VINS

bonjour

Tan 50 = BH/5

BH = 5 * tan 50 ≅ 5.96 cm

HC² = 9² - 5.96² = 81 - 35.5 = ≅ 45. 5

HC = √45.5 ≅ 6.7 cm

≅( 13.7 x 5.96 ) / 2 = ≅ 40.8 cm ²

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