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Sagot :

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Aire du disque troué

(π×10,5²)-(π×7²)=346,36 -153,94=192,42 cm²

Aire de la demi sphere

(4π×7²)÷2=307,88 cm²

Aire totale

192,42+307,88=500,3 cm²=0,05 m²

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