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No. 24
Diketahui tabung dengan :
- d = 84 dm maka r = 84dm ÷ 2 = 42dm
- t = 19 dm
Ditanya : volume tabung ……..?
★ Penyelesaian
V = πr²t
V = 22/7 × 42dm × 42dm × 19dm
V = 22 × 6dm × 42dm × 19dm
V = 105.336 dm³
V = 105.336 dm³
V = 105.336 liter
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No. 25
Diketahui bola dengan :
- r = 7 cm
Ditanya : Volume bola……?
★ Penyelesaian
V = 4/3πr³
V = 4/3 × 22/7 × 7cm × 7cm × 7cm
V = 4/3 × 22 × 1cm × 7cm × 7cm
V = 4/3 × 22 × 49cm³
V = 4/3 × 1.078cm³
V = 1.437,33 cm³
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No. 26
Diketahui setengah bola dengan :
- r = 14 cm
Ditanya : volume setengah bola ….. ?
★ Penyelesaian
V = ½ × 4/3 × πr³
V = 2/3πr³
V = 2/3 × 22/7 × 14cm × 14cm × 14cm
V = ⅔ × 22 × 2cm × 14cm × 14cm
V = ⅔ × 8.624cm³
V = 5.749,33 cm³
24. V tabung
= πr²t
= 22/7 × (84/2)² × 19
= 22/7 × 42² × 19
= 22 × 6 × 42 × 19
= 105.336 liter
25. V = 4/3×π×r³
= 4/3 × 22/7 × 7 × 7 × 7
= 4/3 × 22 × 7 × 7
= 4/3 × 1.078
= 1.437,33 cm³
26. V = 1/2 × 4/3 × π × r³
= 1/2 × 4/3 × 22/7 × 14³
= 1/2 × 4/3 × 22 × 2 × 14²
= 11 × 4/3 × 2 × 196
= 4.312 × 4/3
= 5.749,33 cm³