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962,5 = 22/7 × r²
r² = 962,5/22 × 7
r² = 306,25
r = √306,25
r = 17,5 cm
L permukaan = 2πr (t + r)
7.425 = 2 × 22/7 × 17,5 (t + 17,5)
7.525 = 110 (t + 17,5)
7.425 = 110t + 1.925
7.425 - 1.925 = 110t
5.500 = 110 t
t = 5.500/110
t = 50 cm
Jadi r = 17,5 cm
Tinggi = 50 cm