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V=πr²t = 1 liter = 1 dm³
r²=1/πt
r=√(1/πt) dm
Luas 1 wadah = πr²+2πrt = π√(1/πt)² + 2π√(1/πt)t
= π(1/πt) + 2√πt
= 1/t + 2√πt dm²
(JAWABAN : A)