On assimile la Terre à une sphère de rayon \( 6\:400\:\text{km} \).
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On pourra faire pivoter la figure en cliquant dessus.
Déterminer le rayon du parallèle passant à Ar Raqqah de coordonnées (36° N, 39° E).
On arrondira donnera un résultat arrondi au \( km \).