b. 30 cm
Penjelasan dengan langkah-langkah:
Volume = 79,2 liter = 79,2 dm³ = 79.200 cm³
Tinggi tabung = 28 cm
Jari-jari = ? cm
V = πr²t
79.200 = 22/7 × r² × 28
79.200 = 22/7 × 28 × r²
79.200 = 616/7 × r²
79.200 = 88 × r²
88 × r² = 79.200
r² = 79.200 ÷ 88
r² = 900
r = √900
r = 30 cm
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b. 30 cm
Penjelasan dengan langkah-langkah:
Volume = 79,2 liter = 79,2 dm³ = 79.200 cm³
Tinggi tabung = 28 cm
Jari-jari = ? cm
V = πr²t
79.200 = 22/7 × r² × 28
79.200 = 22/7 × 28 × r²
79.200 = 616/7 × r²
79.200 = 88 × r²
88 × r² = 79.200
r² = 79.200 ÷ 88
r² = 900
r = √900
r = 30 cm