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= 2/3x22/7x21x21x21
= 19.404
v.kerucut = 1/3Πr(kuadrat)t
= 1/3 x 22/7 x 21 x 21 x 21
= 9702
sisa pasir dalam wadah setengah bola =19.404-9702
= 9702
jadi, jawabannya D.9702