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500 π = 2πr(r + t)
500 = 2r(r + t)
500 = 2 x 2A (2A + 3A)
500 = 4A(5A)
500 = 20A²
A² = 25
A = 5 cm
Tinggi tabung = 3A
= 3 x 5
= 15 cm