Sebuah bandul besi yg terbentuk setengah bola dankerucut jika panjang 14 cm tinggi kerucut 24 cm dan berat setiap 1 cm2 adalah 10 gram
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r = 7 cm
t = 24 cm
V = ⅔πr³ + πr²t/3
V = πr²(⅔r + t/3)
V = 22/7 x 7²(⅔ x 7 + 24/3)
= 154 x ( 14/3 + 24/3)
= 154 x 38/3
= 1.950,67 cm³
berat bandul
= 1.950,67 x 10
= 19.506,7 gram
= 19,5067 kilogram