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= 42 cm : 2
= 21 cm
La = π × r²
= 22/7 × 21²
= 22/7 × 441
= 22 × 63
= 1386 cm²
V = La × t
= 1386 cm² × 80 cm
= 110880 cm³
= 110,88 dm³
= 110,88 liter
Jadi minyak tanah yang diperlukan untuk mengisi penuh drum adalah 110,88 liter.