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v = 4/3 x 22/7 x 21³ ⇒ 4x22x21x21 ⇒ 38808 cm³
r=√(Luas/4π)=√(1386/(4.22/7))=√110,25=10,5
Volume=r/3 Luas =10,5/3 x 1386= 4851 cm³