Jika Berat Bandul Setiap 1 Cm Kubik adalah 10 gram, maka berat bandul tersebut adalah?....

AC=s=20cm
OB=r=12cm phi=3,14

L.alas=phi×r×r
=3,14×12×12=452,16cm persegi
[tex]s = \sqrt{ {r}^{2} + {t}^{2} } [/tex]
[tex]20 = \sqrt{ {12 }^{2} + {t}^{2} } [/tex]
[tex] {t}^{2} = \sqrt{ {20}^{2} - {12}^{2} } [/tex]

[tex] t = \sqrt{256} [/tex]
t=16cm

V.kerucut=1/3×phi×r×r×t
=1/3×3,14×12×12×16
=2411,52cm kubik

V.stengah bola=2/3×phi×r×r×r
=2/3×3,14×12×12×12
=2/3×5425,92=3617,28cm kubik
V.total=V.kerucut+V.stengah bola
=2411,52+3617,28=6028,8cm kubik

1cm kubik=10gram
6028,8cm kubik=60288gram=60,288kg ( C )