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» π r^2
» 22/7 . 21/2 . 21/2
» 693/2
» 346,5 cm^2
L Lingkaran Kecil :
» π r^2
» 22/7 . 21/4 . 21/4
» 1386/16
» 86,6 cm^2
L daerah Arsiran :
» L Lingkaran Besar - L Lingkaran Kecil
» 346,5 - 86,6
» 259,9 cm^2