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2 . luas alas + luas selimut
2πr^2 + 2πrt = 792
2 . 22/7 . r^2 + 2 . 22/7 . r . 11 = 792 ==> kedua ruas bagi 44
1/7 r^2 + 11/7 r = 18 ===> kedua ruas kali 7
r^2 + 11r = 126
r^2 + 11r - 126 = 0
(r + 18)(r - 7) = 0
r = -18 atau r = 7
Karena jari-jari selalu positif maka r = 7
Diameter = 2r = 2(7) = 14 cm