bonjour
πR² / 2 = (π2.5² ) / 2 = 9.8 arrondi dixième
aire du 1/2 disque ≅ 9.8 cm²
BC² = 5² + 7²
BC² = 25 + 49 = 74
BC = √74 ≅ 8.6 cm
( 7 * 5 ) / 2 = 17.5
aire triangle = 17.5 cm²
8 * 8.6 = 68.8
aire BCDE = 68.8 cm²
reste à additionner
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bonjour
πR² / 2 = (π2.5² ) / 2 = 9.8 arrondi dixième
aire du 1/2 disque ≅ 9.8 cm²
BC² = 5² + 7²
BC² = 25 + 49 = 74
BC = √74 ≅ 8.6 cm
( 7 * 5 ) / 2 = 17.5
aire triangle = 17.5 cm²
8 * 8.6 = 68.8
aire BCDE = 68.8 cm²
reste à additionner