Perhatikan gambar berikut! 21 cm 30 cm 42 cm Tentukan volume bangun tersebut! Jawab:
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V 1/2 bola = 1/2 x 4/3 x π x r³
= 1/2 x 4/3 x 22/7 x 21 x 21 x 21
= 4 x 11 x 21 x 21
= 19.404 cm³
V tabung = luas alas x tinggi
= π x r² x t
= 22/7 x 21 x 21 x 21
= 22 x 3 x 21 x 21
= 29.106 cm³
V kerucut = 1/3 x luas alas x tinggi
= 1/3 x π x r² x t
= 1/3 x 22/7 x 21 x 21 x 30
= 22 x 3 x 21 x 10
= 13.860 cm³
V gabungan = V 1/2 bola + V tabung + V kerucut
= 19.404 + 29.106 + 13.860
= 62.370 cm³