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Sagot :

Bonsoir,

aire petit cercle:

Pir² ->

3,14 * 3² =>28,26cm²

aire anneau gris:

(3,14 * 9²) - 28,26 =>226,08cm²

=> 28,26/ 226,08 = 0,125

=> 1/ 8

1 chance sur 8

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