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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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