Jawaban:

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Penjelasan dengan langkah-langkah:

1) r = d/2 = 21/2 = 10,5 cm

V. ½ Bola = ½ x 4/3πr³ = ½ x 4/3 x 22/7 x 10,5³ = 2.425,5 cm³

V. Kerucut = ⅓πr²t = ⅓ x 22/7 x 10,5² x 45 = 5.197,5 cm³

V. Bangun = 2.425,5 cm³ + 5.197,5 cm³ = 7.623 cm³

2) V. Kubus = s³ = 20³ = 8.000 mm³

V. Balok = p x l x t = 50 x 20 x 20 = 20.000 mm³

V. Bangun = 8.000 mm³ + 20.000 mm³ = 28.000 mm³

3) r = d/2 = 70/2 = 35 m

V. Balok = p x l x t = 100 x 70 x 20 = 140.000 m³

V. ½ Tabung = ½πr²t = ½ x 22/7 x 35² x 100 = 192.500 m³

V. Bangun = 140.000 m³ + 192.500 m³ = 332.500 m³